Upgrading to a stronger bypass or blow-off valve on your Mazdaspeed3 can produce a more consistent power output and eliminate the chance of leaking boost at wide-open-throttle. The TurboXS Hybrid blow-off valve is a heavy duty direct stock bypass valve replacement that will not leak under stock or increased boost levels, due to its heavy duty valve spring and adjustable spring tension. What makes the Hybrid valve unique is its hybrid venting design, which allows it to function as a standard recirculation valve under low boost, but function as a vent to atmosphere valve under high boost. This gives you the best of both worlds, producing the sporty atmospheric blow-off sound that everyone loves without affecting the daily drivability of your Mazdaspeed3. This kit includes the TurboXS Hybrid valve with integrated Mazdaspeed3 specific flange, installation instructions and spring shims.