More Power - ours holds the boost, can yours?

Factory diverter valves are commonly known to leak or fail, especially with age or higher boost levels. A GFB TMS will hold as much boost as you can throw at it, 24/7 - No frequent re-builds or replacement required.
Better response through reduced turbo lag

The GFB TMS is designed specifically to minimize lag - tests show that it can return the engine to peak boost up to 30% faster than a factory diverter when shifting gears, whilst delivering up to 40% more transitional boost*.
Better Drivability - smoother than stock

Factory diverters tend to operate either fully open or fully shut. This can cause annoying surging at freeway speeds, requiring constant throttle corrections to hold a steady speed. The GFB TMS completely eliminates this problem, making the car smoother to drive.
Get the sound - or not, it’s your choice

Want noise? GFB’s Hybrid or patented Respons, Stealth FX and Deceptor Pro succeed where others have failed! By adjusting the venting ratio of atmosphere/recirc, you CAN achieve a sound WITHOUT throwing a CEL, running rich, stalling, using more fuel or causing any other problems commonly associated with atmo-venting valves.


Features and Benefits:
Direct bolt in replacement for Evo 8 / 9 / 10
Advanced TMS benefits
Spring pre-load adjustment for max. response
Venting configurations:
- Full progressive bias adjustment from recirc (silent) to atmosphere (loud)
- Bias adjustment done manually via cap ring
- Can be locked off in full recirc mode for legality purposes