As the name suggests, the GFB Respons is designed specifically with the aim of improving throttle response and reducing turbo lag.

The GFB Respons TMS

What’s TMS? GFB’s Turbo Management System is the term we apply to our diverter valves that have features designed specifically for the purpose of turbo lag reduction.

Tests show that TMS features can return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears*.

On top of the TMS benefits, the Respons also packs GFB’s patented adjustable venting bias system found on the Stealth FX.

This unique system allows the amount of air vented to either recirc or atmosphere to be infinitely varied to change the venting sound like a stereo volume dial!

So if you want noise with your performance, the Respons can deliver! By fine-tuning the venting ratio, you CAN achieve a blow-off sound WITHOUT throwing a CEL, running rich, stalling, using more fuel or causing any other problems commonly associated with atmoventing valves on cars withMAFsensors.

(*Chart shows comparative manifold boost pressure rise during 1st to 2nd gear shift as tested on a CA18DET with a T28 turbo. GFB TMS improvement is seen as a 30% faster return to peak boost, during which time up to 40% more boost is available)  

How GFB’s patented 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.

Respons Sounds and Videos

(click here) || Whistling Trumpet

(click here) || Standard Trumpet

(click here) || Respons TMS Insider Video

    (**Available in universal hose mount, pipe mount, and direct bolt-on configurations to suit a huge range of cars. The list below illistrates the most popular models. However, use the 'Select by Car' function if your model doesn't appear on the list.)

 T9000 Subaru WRX/STi MY99-00, Forester GT/XT MY98-04, Legacy B4

T9001 Subaru WRX MY08-on, Forester XT MY08-on, Legacy GT MY03-09

T9002 Nissan Skyline GTS-T/GT-T R32-34, and Mazda 3 & 6 MPS, CX-7

T9202 Nissan GTR R35 (2 valves included)

T9003 Subaru WRX MY01-07, STi MY02-on, Forester XT MY05-07

T9004 Nissan Silvia/200SX S14-15

T9025 VW/Audi - all 1.8t models and replacement for plastic Bosch diverter

T9033 Mitsubishi EVO I-X

T9035 Universal (35mm inlet, 30mm outlet)