Boomba Recirculating Bypass Valve Subaru STI 2004-2021 - Blue | 001000220300 has-openbox resulting in more consistent airflow

resulting in more consistent airflow to the turbo:

In our monotube dampers

Better performance in racing and high-revving applications

Features: Fits Wheel Bolt Pattern: 5x108

Boomba Recirculating Bypass Valve Subaru STI 2004-2021 - Blue | 001000220300 has-openbox resulting in more consistent airflowFitment Information: 2004 2021 Subaru STI 2002 2007 Subaru WRX Features: The Boomba Racing high performance recirculating BPV has been designed to be a replacement for the OEM bypass valve and is precision machined out of aircraft grade billet aluminum. It features an internal brass piston design and is pressure tested to withstand over 70psi, allowing it to compliment even the most aggressive turbo builds. Higher spring pre load allows for more boost