FLOWMASTER AMERICAN THUNDER CAT-BACK EXHAUST SYSTEM, ALUMINIZED STEEL, NATURAL FINISH -- 50-state legal; Designed specifically to meet California Air Resources Board standards; Legal for sale or use in California; 3 in. main piping diameter, 3 in. tail pipe diameter; Dual rear exit exhaust system; Single inlet and dual outlet muffler configuration; Includes muffler, Y-pipe, pipes, clamps, bolt, washers, and dual 3 in. polished stainless steel tips with embossed logo, round shape, angle cut, and non-rolled edge design; 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; Easy installation; No system modification required; Made in USA; With Flowmaster's limited 3-year warranty.