Skunk2 Down pipes ae designed to significantly improve exhaust flow allowing the turbo to spool up and build boost quicker. Made from mandrel bent 304 stainless steel, TIG welded, features sensor bung, and heavy duty flanges. Skunk2 Test pipes are designed to dramatically improve engine performance and increase horsepower by significantly reducing exhaust flow restriction. Skunk2 test pipes features a sensor bung, heavy dity flanges and sk2 badge. Both test pipe and down pipe comes with mounting hardwares and bung plug.