FLOWMASTER AMERICAN THUNDER CAT-BACK EXHAUST SYSTEM, ALUMINIZED STEEL, NATURAL FINISH -- 3 in. main piping diameter; 3 in. tailpipe diameter; Dual rear exit exhaust system; Single inlet and dual outlet muffler configuration; Includes installation hardware, gaskets, Y-pipe assembly, 80 Series Crossflow muffler, and dual polished stainless steel tips; Benefits include reduced backpressure for improved acceleration and towing power, cooler under hood temperatures, cleaner and more efficient burn in the combustion chambers, and better fuel economy; Features mandrel-bent 16-gauge aluminized steel tubing; Delivers lesser interior resonance; Increases horsepower and torque; Welding all slip-fit connections recommended; With Flowmaster's limited 3-year warranty.