Our personal favorite BOV. Inefficient factory blow off valves (BOV) can hinder boost response during shifts and can damage your expensive turbo charger. PERRIN™ offers several choices for owners to choose the best solution to the problem.

Many clients simply want the street presence of a loud phhsst when making a high rpm shift. If that sounds like you, we have your needs covered. With exclusive harmonic amplification cutouts, this valve is LOUD!

Specifically designed for 2002 and up Subaru WRX and STi's, the WS-RBV requires no adapter kit to install. It is designed for people who want to run high boost levels, but still vent their BOV back to the air intake to maintain maximum driveability.