Turbosmart Plumb Back BOV Black WRX (2002-2007) STI (2004-2014) BMW These high tech progressive springs

These high tech progressive springs retain superior ride comfort

The Perrin exhaust kit for the BRZ/FR-S is a full catback exhaust system consisting of 2

5L WRX/STI/LGT

The "Standard" version sacrifices some comfort for reduced deflection and increased noise

Turbosmart Plumb Back BOV Black WRX (2002-2007) STI (2004-2014) BMW These high tech progressive springsThe Plumb Back for the Subaru WRX STI Forester is a high performance fully recirculating BOV, all released pressure is vented back into the intake system. Ideal for cars with sensitive AF meter systems and off road applications as the fully sealed design of the Plumb Back prevents any foreign matter from entering the system. This plumb back comes with a Subaru flange making installation easy on your Subaru WRX STI. FITMENT: Subaru STI 2004 2014 Subaru