Berk Technology BT1601-HFC-MET Honda S2000 High Flow Cat Pipe HFC 63.5mm / 2.5-Inch 63.5mm / 2.5-inch stainless steel tubing Mates perfectly to the OEM or aftermarket header and catback 200-Cell metallic substrate catalyst All hardware and gaskets included Hand assembled and TIG welded with full stainless steel construction