Name: Go Fast Bits Subaru WRX/STi 99-00, B4 Legacy, GT/XT Forester 98-04 Respons TMS Blow-Off Valve
Brand: Go Fast Bits
SKU: T9000
Price: 307.8 USD
Availability: InStock

$307.80

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On the surface, it may look like just another dual-port blow-off valve, but the Respons is actually much more than that. 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!

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

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.

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

SUBARU GT MY98-00
SUBARU XT MY03-04 (Series I)
SUBARU STi MY99-00
SUBARU B4 (BE, BH, BT) EJ20TT MY98-03
SUBARU WRX MY99-00
SUBARU Impreza 2.0 Turbo GT EJ205 MY98-00
SUBARU GT MY01-02

Review pages below for additional information: