Specifically designed to suit the latest turbocharged BMW cars, the KompactBMW Kit consists of two Plumb Back Kompact valves and necessary hoses and clamps. The Kompact BMW Kit is a performance bolt-on replacement for the factory plastic bypass valves offering a more incredible boost response and no leaks. Easy to install and set up, the Kompact BMW Kit is an ideal performance upgrade for N54-engined twin-turbo BMWs (Z4 models require additional pipe kit TS-0203-2001).