MAC 3 Port Boost Solenoid Universal

$121.00

Tax included. Shipping calculated at checkout.

MAC 35 series are the go-to solenoid valve for automotive boost control due to their exceptionally rugged and reliable design. Features waterproof female connector, 1/8″ BSP threads, and includes two 7mm hose tails.

Tuning Notes:

Because this upgraded solenoid affects the way that your vehicle controls boost, it is always recommended that you consult with a tuner immediately following installation. It is not recommended that you drive the car in a way that builds boost without doing so. If you have any questions, don't hesitate to get in touch with us directly!

Suits:

All Turbo Subaru Models

Genuine Subaru Blow Off Valve Flange Gasket #21896AA072

Genuine Subaru Blow Off Valve Flange Gasket #21896AA072

$17.95

Tax included. Shipping calculated at checkout.

Genuine Subaru Blow Off Valve Flange Gasket #21896AA072

*If Unsure Please Confirm With VIN Number*

GFB Atomic Single Stage Boost Controller

$107.00

Tax included. Shipping calculated at checkout.

The Atomic has earned a reputation as being one of the most reliable and effective manual boost controllers on the market, boasting a repeatable and steady boost curve, quick rise rate, and great bang-for-buck!

GFB Screw-in Plug (Block Off Recirc or Atmo Outlet)

$14.50

Tax included. Shipping calculated at checkout.

Screw-in Plug

PSR 3 Port Boost Solenoid 08-21 STI

$149.95

Tax included. Shipping calculated at checkout.

MAC valves are used world-wide by many industry leading motorsport brands and workshops and is a brand you can trust.

Mac 35 Series Valve

The MAC 35 series is a direct solenoid operated 3-way poppet valve. It features a short stroke solenoid, a balanced poppet and powerful return spring. These features translate into high shifting forces, fast consistent response times, and long life. Our unique balanced design means virsatility in piping – the valve can be configured as a 3-way or 2-way – normally closed or normally open or can be used for vacuum, divertor or selector applications.

Features:

Genuine MAC Solenoid Operated 3-Way Valve
Turbosmart Silicone Vacuum Hose
Nickel-Plated Barb Fittings
Vehicle Specific Black Finish Bracket
Vehicle Specific Plug-and-Play Wiring Harness

Tuning Notes:

Because this upgraded solenoid affects the way that your vehicle controls boost, it is always recommended that you consult with a tuner immediately following installation. It is not recommended that you drive the car in a way that builds boost without doing so. If you have any questions, don't hesitate to get in touch with us directly!

Suits:

08-21 STI

PSR 3 Port Boost Solenoid WRX 08-14 Forester XT 08-13 Liberty GT 04-09

PSR 3 Port Boost Solenoid WRX 08-14 Forester XT 08-13 Liberty GT 04-09

$149.95

Tax included. Shipping calculated at checkout.

MAC valves are used world-wide by many industry leading motorsport brands and workshops and is a brand you can trust.

Mac 35 Series Valve

The MAC 35 series is a direct solenoid operated 3-way poppet valve. It features a short stroke solenoid, a balanced poppet and powerful return spring. These features translate into high shifting forces, fast consistent response times, and long life. Our unique balanced design means virsatility in piping – the valve can be configured as a 3-way or 2-way – normally closed or normally open or can be used for vacuum, divertor or selector applications.

Features:

Genuine MAC Solenoid Operated 3-Way Valve
Turbosmart Silicone Vacuum Hose
Nickel-Plated Barb Fittings
Vehicle Specific Black Finish Bracket
Vehicle Specific Plug-and-Play Wiring Harness

Tuning Notes:

Because this upgraded solenoid affects the way that your vehicle controls boost, it is always recommended that you consult with a tuner immediately following installation. It is not recommended that you drive the car in a way that builds boost without doing so. If you have any questions, don't hesitate to get in touch with us directly!

Suits:

08-14 Subaru WRX
08-12 Subaru Forester XT SH
04-09 Subaru Liberty GT BL/BP

PSR 3 Port Boost Solenoid 01-07 WRX/STI

$149.95

Tax included. Shipping calculated at checkout.

Tuning Notes:

Because this upgraded solenoid affects the way that your vehicle controls boost, it is always recommended that you consult with a tuner immediately following installation. It is not recommended that you drive the car in a way that builds boost without doing so. If you have any questions, don't hesitate to get in touch with us directly!

Suits:

01-07 WRX & STI

Grimmspeed Manual Boost Controller

$149.00

Tax included. Shipping calculated at checkout.

Product Description
Superior Range with Ultra-Fine Resolution!
Welcome to the next evolution of boost control, The GrimmSpeed Manual Boost Controller. Introducing the most refined Manual Boost Controller available on the market. We spent over a year working hand in hand with tuners across the country to devolop our MBC. Our Manual Boost Controller allows you to raise the OEM boost levels in a quick and efficient manner. Adding the MBC will result in Quicker Spool Up, Quicker Response, Increased Horsepower, and Increased Torque.

Over 250 Way Adjustable
Heavy Duty SST Dual Ball Detent System (Clicks with each turn for active feedback)
Laser Etched Scale and Labels (Easy to read and repeat precise adjustments)
Extra Long Travel Spring (ONE spring, no need to switch Springs)
Superior Range without Sacrificing Resolution (0-60 PSI Capabilities with Ultra-Fine adjustments)
Universal Mounting Solution (Incredibly Durable and Ergonomic

This is the first of its kind with Exact Control technology utilizing over 250 adjustment points that lock in place using a heavy duty stainless dual ball detent system. An extra long travel spring gives you superior range unmatched by any other manual boost controller while maintaining a high resolution, not some vague guess at where to set your boost. Don't trust the life of your engine to trial and error, rather pinpoint your setting using our rising scale running the length of the controller, lock and load. CNC’d from weapon’s grade 6061 Aluminum and laser etched our MBC will outlast your vehicle! The GrimmSpeed Manual Boost Controller redefines precise control and will promise you the results you demand.

Will work with any OEM or Aftermarket turbo application.

*We recommend a professional dyno tune with use of aftermarket boost adjustment items*

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 10-14 GT Liberty

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 10-14 GT Liberty

$219.00

Tax included. Shipping calculated at checkout.

Using GFB’s TMS technology the Mach 2 can help return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears (more information below).

Recirculation model for direct factory replacement for performance without the noise
Atmosphere venting kits to convert the recirculating valve if you want noise with your performance

Like the Respons and Deceptor Pro II, the Mach 2 is available in a range of bolt-on kits for most popular turbo models. And when we say “bolt-on”, that’s exactly what we mean! No additional adaptors, parts or vehicle modifications are required – simply remove the factory bypass valve and replace it with the Mach 2 – it’s that simple!

The Mach 2 is configured as a 100% recirculating valve (i.e. bypass, plumb back) and add on kits are also available to convert to 100% atmosphere venting.

Use the recirc model for direct factory replacement when you want the performance WITHOUT the noise! Add the conversion kit when you want some noise with your performance!

Factory bypass valves have two main shortcomings – one is that they are typically designed to start opening above a certain pressure to protect the engine, and the other is they are not optimised for throttle response. Oh, and you can’t vent them to atmosphere without stalling your engine…
The Mach 2 solves all of these issues. It can effectively hold unlimited boost (unlimited in that no turbo could ever produce enough pressure to damage it), and the TMS technology ensures maximum throttle response

Suits:

10-14 GT Liberty

Install Guide

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 04-09 GT Liberty 08-12 XT Forester 08-14 Impreza WRX

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 04-09 GT Liberty 08-12 XT Forester 08-14 Impreza WRX

$244.00

Tax included. Shipping calculated at checkout.

Using GFB’s TMS technology the Mach 2 can help return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears (more information below).

Recirculation model for direct factory replacement for performance without the noise
Atmosphere venting kits to convert the recirculating valve if you want noise with your performance

Like the Respons and Deceptor Pro II, the Mach 2 is available in a range of bolt-on kits for most popular turbo models. And when we say “bolt-on”, that’s exactly what we mean! No additional adaptors, parts or vehicle modifications are required – simply remove the factory bypass valve and replace it with the Mach 2 – it’s that simple!

The Mach 2 is configured as a 100% recirculating valve (i.e. bypass, plumb back) and add on kits are also available to convert to 100% atmosphere venting.

Use the recirc model for direct factory replacement when you want the performance WITHOUT the noise! Add the conversion kit when you want some noise with your performance!

Factory bypass valves have two main shortcomings – one is that they are typically designed to start opening above a certain pressure to protect the engine, and the other is they are not optimised for throttle response. Oh, and you can’t vent them to atmosphere without stalling your engine…
The Mach 2 solves all of these issues. It can effectively hold unlimited boost (unlimited in that no turbo could ever produce enough pressure to damage it), and the TMS technology ensures maximum throttle response

Suits:

04-09 GT Liberty
08-12 XT Forester
08-14 Impreza WRX

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 05-07 XT Forester (Facelift) 01-07 Impreza WRX & STI 08-20 STI

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 05-07 XT Forester (Facelift) 01-07 Impreza WRX & STI 08-20 STI

$244.00

Tax included. Shipping calculated at checkout.

Using GFB’s TMS technology the Mach 2 can help return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears (more information below).

Recirculation model for direct factory replacement for performance without the noise
Atmosphere venting kits to convert the recirculating valve if you want noise with your performance

Like the Respons and Deceptor Pro II, the Mach 2 is available in a range of bolt-on kits for most popular turbo models. And when we say “bolt-on”, that’s exactly what we mean! No additional adaptors, parts or vehicle modifications are required – simply remove the factory bypass valve and replace it with the Mach 2 – it’s that simple!

The Mach 2 is configured as a 100% recirculating valve (i.e. bypass, plumb back) and add on kits are also available to convert to 100% atmosphere venting.

Use the recirc model for direct factory replacement when you want the performance WITHOUT the noise! Add the conversion kit when you want some noise with your performance!

Factory bypass valves have two main shortcomings – one is that they are typically designed to start opening above a certain pressure to protect the engine, and the other is they are not optimised for throttle response. Oh, and you can’t vent them to atmosphere without stalling your engine…
The Mach 2 solves all of these issues. It can effectively hold unlimited boost (unlimited in that no turbo could ever produce enough pressure to damage it), and the TMS technology ensures maximum throttle response

Suits:

05-07 XT Forester (Facelift)
01-07 Impreza WRX & STI
08-20 STI

Install Guide

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 98-00 GT Forester 03-04 XT Forester 99-00 STI 98-03 Liberty GT & B4

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 98-00 GT Forester 03-04 XT Forester 99-00 STI 98-03 Liberty GT & B4

$244.00

Tax included. Shipping calculated at checkout.

Using GFB’s TMS technology the Mach 2 can help return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears (more information below).

Recirculation model for direct factory replacement for performance without the noise
Atmosphere venting kits to convert the recirculating valve if you want noise with your performance

Like the Respons and Deceptor Pro II, the Mach 2 is available in a range of bolt-on kits for most popular turbo models. And when we say “bolt-on”, that’s exactly what we mean! No additional adaptors, parts or vehicle modifications are required – simply remove the factory bypass valve and replace it with the Mach 2 – it’s that simple!

The Mach 2 is configured as a 100% recirculating valve (i.e. bypass, plumb back) and add on kits are also available to convert to 100% atmosphere venting.

Use the recirc model for direct factory replacement when you want the performance WITHOUT the noise! Add the conversion kit when you want some noise with your performance!

Factory bypass valves have two main shortcomings – one is that they are typically designed to start opening above a certain pressure to protect the engine, and the other is they are not optimised for throttle response. Oh, and you can’t vent them to atmosphere without stalling your engine…
The Mach 2 solves all of these issues. It can effectively hold unlimited boost (unlimited in that no turbo could ever produce enough pressure to damage it), and the TMS technology ensures maximum throttle response

Suits:

98-00 GT Forester
03-04 XT Forester
99-00 STI
98-03 Liberty GT & B4

Install Guide

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 97-98 Impreza WRX

GFB Mach 2 TMS Recirculating Diverter Valve Direct Fitment 97-98 Impreza WRX

$219.00

Tax included. Shipping calculated at checkout.

Using GFB’s TMS technology the Mach 2 can help return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears (more information below).

Recirculation model for direct factory replacement for performance without the noise
Atmosphere venting kits to convert the recirculating valve if you want noise with your performance

Like the Respons and Deceptor Pro II, the Mach 2 is available in a range of bolt-on kits for most popular turbo models. And when we say “bolt-on”, that’s exactly what we mean! No additional adaptors, parts or vehicle modifications are required – simply remove the factory bypass valve and replace it with the Mach 2 – it’s that simple!

The Mach 2 is configured as a 100% recirculating valve (i.e. bypass, plumb back) and add on kits are also available to convert to 100% atmosphere venting.

Use the recirc model for direct factory replacement when you want the performance WITHOUT the noise! Add the conversion kit when you want some noise with your performance!

Factory bypass valves have two main shortcomings – one is that they are typically designed to start opening above a certain pressure to protect the engine, and the other is they are not optimised for throttle response. Oh, and you can’t vent them to atmosphere without stalling your engine…
The Mach 2 solves all of these issues. It can effectively hold unlimited boost (unlimited in that no turbo could ever produce enough pressure to damage it), and the TMS technology ensures maximum throttle response

Suits:

97-98 Impreza WRX

Install Guide

GFB Deceptor Pro II TMS 10-14 (BM, BR) Liberty GT

GFB Deceptor Pro II TMS 10-14 (BM, BR) Liberty GT

$540.00

Tax included. Shipping calculated at checkout.

Now You Can Control The Sound Of The BOV From Inside The Cabin!

So how much more can you do with a blow-off valve? Well, the Deceptor Pro II takes the ‘Respons’ concept even further...

Adjust your BOV venting bias electronically on-the-fly

Revised porting to optimise flow and venting bias

Compact design fits in most factory valve locations

Direct bolt on for many vehicles

New bore finishing process ensures a lifetime of reliable operation

Deceptor Pro II features
Direct bolt-on for most vehicles available:

Remote proportional venting bias/volume control- from silent to loud or anywhere in between
Sleek, compact in-car BOV volume controller with backlit dial
End point adjustment to control maximum vent to atmosphere bias setting
Volume adjustment mechanism driven by a high-torque geared electric motor
Durable, low-friction gear train supported by precision sealed ball-bearing
Supplied with all parts and wiring required to have it up and running quickly and easily

Suits:

10-14 (BM, BR) Liberty GT

Install Guide

GFB Deceptor Pro II TMS 14-On XT Forester (FA20 Engine) 15-On WRX (FA20 Engine) 16 On Levorg FB16/FA20 Turbo

GFB Deceptor Pro II TMS 14-On XT Forester (FA20 Engine) 15-On WRX (FA20 Engine) 16 On Levorg FB16/FA20 Turbo

$540.00

Tax included. Shipping calculated at checkout.

Now You Can Control The Sound Of The BOV From Inside The Cabin!

So how much more can you do with a blow-off valve? Well, the Deceptor Pro II takes the ‘Respons’ concept even further...

Adjust your BOV venting bias electronically on-the-fly

Revised porting to optimise flow and venting bias

Compact design fits in most factory valve locations

Direct bolt on for many vehicles

New bore finishing process ensures a lifetime of reliable operation

Deceptor Pro II features
Direct bolt-on for most vehicles available:

Remote proportional venting bias/volume control- from silent to loud or anywhere in between
Sleek, compact in-car BOV volume controller with backlit dial
End point adjustment to control maximum vent to atmosphere bias setting
Volume adjustment mechanism driven by a high-torque geared electric motor
Durable, low-friction gear train supported by precision sealed ball-bearing
Supplied with all parts and wiring required to have it up and running quickly and easily

Suits:

14-On XT Forester SJ (FA20 Engine)
15-On WRX (FA20 Engine)
16 On Levorg FB16/FA20 Turbo

Install Guide

GFB Deceptor Pro II TMS 03-09 Liberty GT 08-12 SH XT Forester 08-14 Impreza WRX

GFB Deceptor Pro II TMS 03-09 Liberty GT 08-12 SH XT Forester 08-14 Impreza WRX

$540.00

Tax included. Shipping calculated at checkout.

Now You Can Control The Sound Of The BOV From Inside The Cabin!

So how much more can you do with a blow-off valve? Well, the Deceptor Pro II takes the ‘Respons’ concept even further...

Adjust your BOV venting bias electronically on-the-fly

Revised porting to optimise flow and venting bias

Compact design fits in most factory valve locations

Direct bolt on for many vehicles

New bore finishing process ensures a lifetime of reliable operation

Deceptor Pro II features
Direct bolt-on for most vehicles available:

Remote proportional venting bias/volume control- from silent to loud or anywhere in between
Sleek, compact in-car BOV volume controller with backlit dial
End point adjustment to control maximum vent to atmosphere bias setting
Volume adjustment mechanism driven by a high-torque geared electric motor
Durable, low-friction gear train supported by precision sealed ball-bearing
Supplied with all parts and wiring required to have it up and running quickly and easily

Suits:

03-09 Liberty GT
08-12 SH XT Forester
08-14 Impreza WRX

Install Guide

GFB Deceptor Pro II TMS 01-07 Impreza WRX & STI 08-20 STI Only 05-07 XT Forester (Facelift Model)

GFB Deceptor Pro II TMS 01-07 Impreza WRX & STI 08-20 STI Only 05-07 XT Forester (Facelift Model)

$540.00

Tax included. Shipping calculated at checkout.

Now You Can Control The Sound Of The BOV From Inside The Cabin!

So how much more can you do with a blow-off valve? Well, the Deceptor Pro II takes the ‘Respons’ concept even further...

Adjust your BOV venting bias electronically on-the-fly

Revised porting to optimise flow and venting bias

Compact design fits in most factory valve locations

Direct bolt on for many vehicles

New bore finishing process ensures a lifetime of reliable operation

Deceptor Pro II features
Direct bolt-on for most vehicles available:

Remote proportional venting bias/volume control- from silent to loud or anywhere in between
Sleek, compact in-car BOV volume controller with backlit dial
End point adjustment to control maximum vent to atmosphere bias setting
Volume adjustment mechanism driven by a high-torque geared electric motor
Durable, low-friction gear train supported by precision sealed ball-bearing
Supplied with all parts and wiring required to have it up and running quickly and easily

Suits:

01-07 Impreza WRX & STI
08-21 STI Only
05-07 XT Forester (Facelift Model)

Install Guide

GFB Deceptor Pro II TMS 98-00 GT Forester 03-04 XT Forester 99-00 Impreza WRX & STI 98-03 Liberty GT & B4

GFB Deceptor Pro II TMS 98-00 GT Forester 03-04 XT Forester 99-00 Impreza WRX & STI 98-03 Liberty GT & B4

$540.00

Tax included. Shipping calculated at checkout.

Now You Can Control The Sound Of The BOV From Inside The Cabin!

So how much more can you do with a blow-off valve? Well, the Deceptor Pro II takes the ‘Respons’ concept even further...

Adjust your BOV venting bias electronically on-the-fly

Revised porting to optimise flow and venting bias

Compact design fits in most factory valve locations

Direct bolt on for many vehicles

New bore finishing process ensures a lifetime of reliable operation

Deceptor Pro II features
Direct bolt-on for most vehicles available:

Remote proportional venting bias/volume control- from silent to loud or anywhere in between
Sleek, compact in-car BOV volume controller with backlit dial
End point adjustment to control maximum vent to atmosphere bias setting
Volume adjustment mechanism driven by a high-torque geared electric motor
Durable, low-friction gear train supported by precision sealed ball-bearing
Supplied with all parts and wiring required to have it up and running quickly and easily

Suits:

98-00 GT Forester
03-04 XT Forester
99-00 Impreza WRX & STI
98-03 Liberty GT & B4

Install Guide

GFB Deceptor Pro II TMS 97-98 Impreza WRX

GFB Deceptor Pro II TMS 97-98 Impreza WRX

$540.00

Tax included. Shipping calculated at checkout.

Now You Can Control The Sound Of The BOV From Inside The Cabin!

So how much more can you do with a blow-off valve? Well, the Deceptor Pro II takes the ‘Respons’ concept even further...

Adjust your BOV venting bias electronically on-the-fly

Revised porting to optimise flow and venting bias

Compact design fits in most factory valve locations

Direct bolt on for many vehicles

New bore finishing process ensures a lifetime of reliable operation

Deceptor Pro II features
Direct bolt-on for most vehicles available:

Remote proportional venting bias/volume control- from silent to loud or anywhere in between
Sleek, compact in-car BOV volume controller with backlit dial
End point adjustment to control maximum vent to atmosphere bias setting
Volume adjustment mechanism driven by a high-torque geared electric motor
Durable, low-friction gear train supported by precision sealed ball-bearing
Supplied with all parts and wiring required to have it up and running quickly and easily

Suits:

97-98 Impreza WRX

G-Force III Electronic Boost Controller

$439.00

Tax included. Shipping calculated at checkout.

The latest iteration of GFB’s feature-packed electronic boost controller now has the ability to monitor and display your engine’s air/fuel ratio in either Lambda or AFR. By connecting the analogue output of most wideband O2 controllers (i.e. Innovate LC-2, AEM UEGO etc, sold separately) to the G-Force III’s auxiliary input, you can toggle between boost pressure and air/fuel ratio display. Not only does this save you from having to install a separate AFR gauge in your car, it can also save your engine!

A lean mixture at high boost can destroy an engine in seconds, and a stand-alone AFR gauge is next to useless when accelerating hard as your concentration is likely to be (and should be!) on the road in front of you. The G-Force III safeguards your engine against a lean mixture by lowering boost to the minimum setting, and visibly warning you by flashing the display lighting.

Whether your car is a daily driver or an all-out track weapon, the G-Force III has the features to tailor boost to suit your needs. Set up to 6 boost presets and select on the fly, use the scramble feature for overtaking, launching, towing, or protecting the engine, and you can even customize the lighting colour to suit your interior! No other EBC on the market offers the features, control, ease of use, and value for money like the G-Force III!

G-Force III Electronic Boost Controller

For boost pressures up to 50psi (3.45bar, 345kpa)
Adjust peak boost, rise rate, and closed-loop correction
Display boost pressure in psi, bar, or kpa
6 boost presets, individually programmable
Unique “scramble” feature with remote switching
Peak boost recall
Air/fuel ratio display in AFR or lambda (when connected to a wideband O2 controller)
Separately adjustable overboost and lean mixture warning/boost cut
Touch buttons with user selectable illumination colours
Auxiliary input to switch boost presets or activate scramble
½ din size casing, fits standard stereo slot
Supplied with Mac 3-port solenoid

Install Guide

GFB Blow Off Valve SV52

$399.00

Tax included. Shipping calculated at checkout.

In the race to create the most compact and highest flowing blow-off valve, GFB’s SV52 pulls ahead of the pack.

Standing only 86mm tall (including the weld-on adaptor), the SV52 is 10mm shorter than the nearest competitor, AND flows more!

Consider these questions when you’re looking for a BOV for your high-powered, forced induction engine:

Will it handle the pressure?…………………………….. YES! Is 300psi enough?

Will it flow enough?………………………………………… YES! It outflows everything else in its class!

Is it small enough to fit my engine bay?…………..YES! 10mm shorter than the nearest competitor!

Will it last?………………YES! It comes with a lifetime warranty!

Strength is important;

Realising that a high-flowing valve like this will see duty in some high-boost environments, we made sure the SV52 tops the class in that category as well, giving it an astonishing boost pressure rating of 300psi!

The SV52 also includes 2 springs PLUS a spring pre-load adjustment system so you can dial it in for optimum throttle response and boost recovery after gearshift, without resorting to the costly hit- and-miss approach of purchasing extra springs.

Suits engines with manifold vacuum ranging from 5-22inHg (17-74.5kPa, 2.5-11psi vacuum)

BODY

The SV52’s unparalleled pressure capacity starts with a monobloc body design, CNC machined from a single aluminium billet that ensures strength without adding unnecessary bulk.

PISTON

The anodized piston bore creates an extremely hard and low-friction surface on which the single piece aluminum 52.5mm piston glides, and will continue to do so over countless cycles. It features an arrangement of Viton o-ring seals unique to GFB.

DESIGN

Why do we use a piston instead of the more common diaphragm design?

Strength and reliability is the primary factor, something that a diaphragm simply cannot match in a high-boost BOV environment. Diaphragms have their place (we use them in our wastegates), as they offer low friction and good sealing capability. However, a rolling diaphragm is only designed to receive a net pressure on one side, which essentially “inflates” it against the walls of the chamber in which it resides, exactly how it is used in a wastegate.

However, a BOV is exposed to frequent pressure reversals – every time you accelerate and lift off.

For a diaphragm, this means it is repeatedly collapsing on itself under boost, then inflating under vacuum. Eventually, this leads to diaphragm failure. A piston on the other hand is immune to this issue, and will continue to operate under the most extreme pressure, temperature, and cyclic conditions.

The unique mounting method of the SV52 is one of the ways we’ve been able to save unnecessary bulk.

By eliminating the v-band style mount, the piston and its venting ports can sit much lower, which reduces the overall height to a number others can’t match.

This is a universal part

GFB Respons 99-00 WRX/STI 98-04 Forester 98-03 Liberty

GFB Respons 99-00 WRX/STI 98-04 Forester 98-03 Liberty

$397.00

Tax included. Shipping calculated at checkout.

Featuring GFB’s patented venting bias adjustment system, the Respons allows you to precisely control how much air vents from each of the two outlets.

Why is this so important? Two key reasons:

Adjust how loud the blow-off sound is. Recirculate all of the air for silent factory operation, vent it all to atmosphere for maximum noise, or set it ANYWHERE in between to suit your preference.

Get a blow-off sound WITHOUT causing stalling, backfiring, or any other BOV-related issues, even on a car with a sensitive airflow meter (MAF).
Hold on, it gets better. The Respons isn’t just a noise-maker. It also;

Offers better throttle response
Faster boost recovery on gearshift
Unlimited boost-holding!

For example, using GFB’s TMS (Turbo Management System) principle, tests show that the Respons can return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears.

GFB Respons Blow Off Valve 1994-98 Impreza WRX & STI

GFB Respons Blow Off Valve 1994-98 Impreza WRX & STI

$397.00

Tax included. Shipping calculated at checkout.

Featuring GFB’s patented venting bias adjustment system, the Respons allows you to precisely control how much air vents from each of the two outlets.

Why is this so important? Two key reasons:

Adjust how loud the blow-off sound is. Recirculate all of the air for silent factory operation, vent it all to atmosphere for maximum noise, or set it ANYWHERE in between to suit your preference.

Get a blow-off sound WITHOUT causing stalling, backfiring, or any other BOV-related issues, even on a car with a sensitive airflow meter (MAF).
Hold on, it gets better. The Respons isn’t just a noise-maker. It also;

Offers better throttle response
Faster boost recovery on gearshift
Unlimited boost-holding!

For example, using GFB’s TMS (Turbo Management System) principle, tests show that the Respons can return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears.

Boost Management

Please Select