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The COBB bypass valve replaces the factory recirculation valve to manage boost and prevent compressor surge on turbocharged Subaru models. It provides a reliable path for excess boost under throttle lift, helping sustain turbo response and reduce stress on the intake system. Fitment is listed for Subaru WRX (2002–2007), STI (2004–2017) and Forester XT (2006–2008) applications.
Cobb 02-07 Subaru XLE BPV WRX 04-17 Subaru STI / 06-08 FXT Bypass Valve
