Perrin Blow Off Valve Recirc Black Subaru WRX 02-07 STI 04-12

For clients that demand idle quality, and the best in drivability we offer a fully recirculated BOV. Like the stock BOV, the PERRIN recirc BOV keeps the vented air in the intake system to keep the ECU happy and running smooth. BOVs that vent to atmosphere can run rich between shifts causing backfires, can cause idle issues, and part throttle drivability on cars that have MAF sensors. This is due to metered air, the ECU thinks is being ingested by the engine, being expelled to the atmosphere.

With the PERRIN BOV, there is no reason to add more washers or change the spring to allow it to hold more boost. This BOV works very different than others in that there is no need to have a spring to hold boost! The boost pressure is put on the back of the piston to keep it closed, and helps keep the piston from lifting prematurely. This allows the BOV to hold more than an almost unlimited amount of boost!

The PERRIN Recirc BOV has many adjustments to tailor it to your driving style and horsepower. You are able to adjust when the BOV releases, and how much it releases by adjusting the spring and flow control screw. These very unique features are things not found on any other BOV.

Fits: Subaru WRX 02-07 and Subaru STI 04+

Available in either a Red or Black annodized body. Please select below.