The STM pipes bolt right up to most aftermarket exhausts and downpipes (anything that keeps the stock location for the cat.) - Fully T304 3" stainless steel. - Available with o2 bung and plug. - 1 year warranty to the original purchaser. - Made right here, in the USA! Evolution VIII and IX. Aveilable with or without an O2 sensor bung, and with or without gaskets. ***This product is intended for track use only and may be illegal to run on local streets.