MAGNAFLOW CAT-BACK EXHAUST SYSTEM, STAINLESS STEEL, NATURAL FINISH -- 50-state legal; Designed specifically to meet California Air Resources Board standards; Legal for sale or use in California; Designed and tested to meet legal sound level limits; Increases horsepower on an average range of 10 percent; 2.5 in. main piping diameter, 2.5 in. tail pipe diameter; Single rear exit; Single inlet and outlet muffler configuration; Includes installation hardware, resonator, polished stainless steel muffler, and single 4 in. polished T-304 stainless steel tip with round shape, angle cut, and rolled edge design; Made of 100 percent tough and durable stainless steel; Dyno tested and proven to provide performance gains in horsepower and torque; Delivers great sound with a smooth and deep tone; Built to last, all welded, and mandrel-bent; Easy weld-on installation.