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The GFB Respons blow-off valve for 1999–2000 Subaru WRX/STI lets you tune venting bias to avoid backfiring or stalling from a fixed-atmosphere BOV while retaining a desirable sound. Twist the adjustment ring to vary recirculation versus atmosphere venting and set the tone between silent and loud. Respons valves use GFB’s TMS technology for rapid boost recovery and improved throttle response, and are rated to withstand boost pressures above 100 psi for robust operation.
GFB 99-00 WRX/STI TMS Respons Blow Off Valve Kit
