The GFB Respons blow-off valve for 2015+ Subaru WRX (FA20DIT) lets you tune how much charge air is recirculated versus vented to atmosphere. Its adjustable venting bias uses GFB’s TMS technology to retain rapid boost recovery and throttle response while avoiding backfire or stalling associated with fixed atmosphere-venting BOVs. Twist the ring to set venting from silent recirc to loud atmosphere release.
GFB 15+ Subaru WRX 2.0L (FA20DIT) AWD Sedan TMS Respons Blow Off Valve Kit