The new Invidia cat-back exhaust system for the R56 Mini Cooper S is one of the highest quality and best sounding exhausts on the market for the R56. It features dual rolled tips and 2.5" piping to guarantee free exhaust flow through your turbo Mini. It's designed to bolt up to the stock downpipe and eliminates the second cat. The system is constructed of fully mandrel bent stainless steel piping which is 2.5" in diameter. All necessary hardware and gaskets are included.