The GFB Respons is designed specifically with the aim of improving throttle response and reducing turbo lag. 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 sometimes associated with atmoventing valves on cars with MAFsensors.

Available in a range of universal hose-mount or direct bolt-on configurations for many popular models:

*Subaru WRX/STi MY97-98
*Subaru WRX MY01-07
*Subaru WRX/STI MY01-MY03 + 2015 STI
*STi MY02-on *Forester XT MY05-07
*Subaru WRX/STi MY99-00
*Forester GT/XT MY98-04
*Legacy B4
*Subaru WRX MY08-on
*Forester XT MY08-on
*Legacy GT MY03-09
*Nissan Skyline GTS-T/GT-T R32-34
*Mazda 3/6 MPS, CX-7
*Nissan GTR R35 (2 valves needed)
*Nissan Silvia/200SX S14-15
*VW/Audi – all 1.8t models
*Ford Falcon XR6 turbo BA-BF
*Mitsubishi EVO I-X