Since getting their start in 1981, Active Autowerke has earned a well-respected reputation in the BMW community for engineering high-quality power solutions for popular BMW models. This single blow off valve kit features a huge venturi that is designed to handle excess boost pressure and protect the stock turbos. As pressure builds up against the turbocharger's impeller blades, it can cause the blades to stop spinning, a condition known as compressor surge. This can damage the compressor wheel and shaft. This blow off valve allows you to safely raise boost pressure, resulting in more power, and of course that iconic "whoosh" sound as your turbocharger system bleeds off excess boost.

Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.