The TurboXS RFL Blow Off Valves are known across the industry as the loudest blow off valves out there. They emit a distinctive sound and are the blow off valve of choice for many tuners. The RFL produces 115db of 'whoosh' at 15psi! The TurboXS RFL is now available as a direct bolt on for the 2008 WRX! This is a complete vent-to-atmosphere blow off valve for the loudest and most aggressive sound. Beware of air-fuel ratio variation and expect intermittent backfires with a vent-to-atmosphere valve such as thi however. We suggest professional tuning when using any VTA blow off valve.
