GFB 02-07 WRX / 04-10 STI TMS Respons Blow Off Valve Kit Ignition>Spark Plug Wire Sets After broaching the high strength

After broaching the high strength ductile iron casting to the appropriate degree that allows retention of the factory spring rate and ride quality

The CORSA Xtreme dual rear exit exhaust system is engineered to out-perform in every way

With zero filter

The exhaust exits thru dual 4" round polished T-304 stainless steel tips on each muffler

50 State Legal CARB Approved

GFB 02-07 WRX / 04-10 STI TMS Respons Blow Off Valve Kit Ignition>Spark Plug Wire Sets After broaching the high strengthIf cars like yours typically suffer issues such as backfiring and stalling when using a fixed ratio atmosphere venting BOV, the Respons can help. By adjusting the venting bias to suit the car you can achieve a blow off sound without having to put up with the issues. Like all GFB valves, the Respons utilises GFB's proven TMS Technology to ensure rapid boost recovery on gearshift and optimum throttle response, as well as the ability to withstand boost