02-06 Nissan Altima 2.5L 4Cyl Catback Exhaust System CNC-machined, made by High Quality Stainless Steel with Mandrel Bent Pipes Bolt-On Design, Increase Horsepower and Torque Gasket, Nuts and Bolts are Included. CAT converter NOT included, please use factory connection. Some welding might be required. Heavy Duty Laser Cut Port Flanges-No Warping or Leaking Premium Gaskets and Hardware