Description: This is designed specifically for all the Volkswagen / Audi 1.8T and the 2.7L engines. Made out of aircraft super strong and light weight Aluminum 6061. Will also work on other cars measuring at 25mm (.986 of an inch) inlet and out if you want it re-circulating. The piston internal is made out of Copper/ Zinc Plated. Precise Adjustment of the Splitter Hybrid Valve is done by turning the ratchet type cap adjustment knob located on the top of the valve Specification: This Splitter Hybrid Diverted Adjustable Valve (aka; Blow Off Valve) is for ALL following models : for Volkswagen 1.8T Engines for Audi 1.8T Engines for Volkswagen 2.7L Bi-turbo Engines (Requires 2x BOV per car for the 2.7L motors) for Audi 2.7L Bi-turbo Engines (Requires 2x BOV's per car for the 2.7L motors) Package Includes: 1xBlow Off Valve