Berk Technology BT1401-HFC-MET Nissan 350Z and Infiniti G35 High Flow Cat Pipe 2.5-Inch with CEL Fix The Gold Standard for Z33/Z44 HFC's 200-Cell metallic substrate catalyst 2.5-inch stainless steel tubing and support brackets All hardware and gaskets included Hand assembled and TIG welded with full stainless steel construction