aFe 49-46402 Mach Force XP 2.5" Cat-Back Exhaust System for Volkswagen Golf TDI 4-Door L4 2.0L with 3" Dual Polished Tip 2 Piece Direct Bolt On 2 Year Limited Warranty 2.5 in. Mandrel Bent 409 Stainless Steel Tubing 5 lbs. Lighter Than OE Increased Horsepower And Torque 2.5 inches diameter tubing 409 stainless steel This system is a 2-piece design that requires no cutting to install and is 5 pounds lighter than the factory exhaust system Dual 3 inches double walled polished stainless steel tip Includes welded-on hangers and OE style band clamps for a simple and leak-free bolt-on installation