Our 3” downpipes are made from 304 stainless steel, tig welded, and comes with everything to install it. Has 2 stock location 02 bungs. 3" throughout and a brief reduction to 2.5" at the end. Proven to be effective on a stock turbo and will bolt-on to a GTX turbos for use beyond 400HP as is. Backed with our limit lifetime warranty for the original buyer.