This American Thunder system fits 2001-2006 GM Suburban, Avalanche and Yukon XL 1500 SUV's and increases the horsepower, torque and mileage of these popular trucks. The exhaust system is constructed from 16-gauge mandrel-bent stainless steel and has a flanged resonator assembly flowing into a specially tuned resonator and a Super 50 Series performance muffler producing a mild to moderate interior tone and a deep exterior sound. The dual 2.50 in. tailpipes exit out the side of the vehicle behind the rear tires and are finished off with large pair of 4.00 in. polished 304 stainless tips. All necessary parts and hardware are included for a great fitting installation and is covered by Limited Lifetime Warranty.