Fitment Information Subaru WRX (2015, 2016, 2017, 218, 2019, 2020, 2021) Emissions Compliance This item does not have a CARB EO Number and does not ship to California or any CARB states. Specs & Features Larger cross section compared to stock 100% recirculating Higher flow Pressure tested to 75 PSI Easy install No need for re-tune Product Description We were able to pick up 15 hp and 9 tq from switching to our piece. This high performance recirculating bypass valve is precision machined out of aircraft grade billet aluminum. It features an internal brass piston design and is pressure tested to withstand up to 75psi, allowing it to compliment even the most aggressive turbo builds. Spring pre-load determines the pressure differential required across the piston before the BOV opens and releases the pressurized intake charge. Designed to be a replacement for the OEM bypass valve and is available in 4 different colors. By applying equal amounts of air pressure to both the charge pipe side as well as the vacuum line side of a BPV, we're able to to simulate real-world boost conditions. Doing this allows us to test the overall construction of the BPV, including the ability to test for leaks. **For Off-Road Use Only** Many Boomba Racing products are sold for off-road use only. All performance modifications and installations are at the customer’s own risk. Boomba Racing Inc or www.boombaracing.com hold no responsibility either implied or otherwise for mechanical, electrical or other failure when using any aftermarket performance products. Items sold for off-road use only are illegal in many states and provinces and are intended for racing vehicles which may never be used on a public road. By purchasing any aftermarket performance product, the customer takes full responsibility for any use, and/or misuse of the product and agrees that Boomba Racing Inc or www.boombaracing.com holds no responsibility for any consequences, legal, or other, of such use and/or misuse.