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 (more information below)

How GFB’s Venting Bias Adjustment Works

Twisting the adjusting ring opens up the atmo port, whilst the recirc port is simultaneously closed.This results in possible venting ratios ranging from 100% recirc, right through to 100% atmosphere and anywhere in between.

Available In A Huge Range Of Universal And Direct Bolt-On Kits

When we say “bolt-on”, that’s EXACTLY what we mean. Everything you need is included, it fits directly in the factory location (not on a separate adaptor), and no modifications to the car are required.

Performance AND sound without compromise!

• Adjust the volume of your blow-off sound
• Up to 30% faster boost recovery on gearshift
• Get the blow off sound without the hassles - even on sensitive MAF-based systems
• Hold unlimited boost pressure
• Direct bolt-on kits available

Get The Inside Information...

GFB is no stranger to dual port BOVs. In fact, GFB pioneered the design in 1999, following up with the venting bias adjustment system in 2001.

This technology is not just a gimmick – it’s the key to getting a blow-off sound without the issues (unlike other valves), and is exclusive to GFB.

“I thought venting to atmosphere couldn’t be done on a car with an airflow meter, so how does the Respons do it?”

We’ve all heard the stories and seen people get shot down on forums when they ask about BOVs. Common responses are “your car will stall,backfire, run rich, go slower, or rip a hole in the space-time continuum that will bring about the end of the universe”. Certainly, if the BOV is not designed or adjusted correctly, at least some of these may be true.

If Everything You’ve Heard Tells You A BOV Won’t Work On Your Car, Try A GFB Respons - You Will Be Surprised!

“How does a GFB Respons improve performance?”

Boost holding

Unlike factory bypass valves, or other brand valves that require different springs for different boost levels, a GFB valve CANNOT be forced open by high boost!

The balanced piston design in a GFB valve uses boost pressure on either side to cancel out the forces. Therefore it doesn’t matter how much boost you run, you can be sure a Respons valve will deliver all of it to the engine.

Throttle response and boost recovery

GFB’s TMS (Turbo Management System) principle is based on an operating method that is different to all factory bypass valves, which can be summarised as:

A factory bypass valve is open until required to shut.

A GFB TMS valve is shut until required to open.

This difference in operating methods means that the GFB valve only vents when required, and only enough air to prevent compressor surge.

For example, during a gearshift it is possible to preserve a small amount of boost pressure for a short duration. Then, when the throttle is then re-opened, peak boost is reached faster than if all pressure is lost (as is the case with the factory valve that remains fully open too long).

This Part Fits:

• MAZDA 6 MPS GG MZR L3-VDT 05-On
• MAZDA CX7 All 2.3 MZR L3-VDT 06-On
• MITSUBISHI Galant VR4 E38A-E39A 4G63 90-93
• NISSAN Skyline R32 GTS-T RB20DET 89-93
• NISSAN Skyline R31 GTS-Turbo RB20DET 85-90
• NISSAN Skyline R34 GT-T RB25DET 98-06
• MAZDA 3 MPS BK MZR L3-VDT 06-09
• MAZDA 3 MPS BL MZR L3-VDT 09-13
• NISSAN Skyline R33 GTS-T RB25DET 1993-1998
• MITSUBISHI Eclipse 1G 4G63t 1990-1994