Designed in the same vein as all of our "RFL" blow off valves, the W15-XS-RFL is Really F'nLoud. Designed specifically for the 2015 WRX using our all new "XS" BOV platform, this valve is designed to vent 100% to atmosphere for the loudest BOV sound possible. This valve comes complete with everything you need to replace your stock bypass valve.
The XS platform adds incredible versatility to this Blow Off Valve. The modular design of the XS platform allows you to change both the inlet and the outlet of the valve. This means that you can buy this valve as a 100% Vent to Atmosphere Blow Off Valve and then with the purchase of your vehicle-specific outlet (sold separately), you can change the valve into a 100% Recirculating Bypass Valve. It's like getting two valves for just a few dollars more than the price of one!