GIBSON DUAL SPORT 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; Gains an average power of 10 to 15 h.p.; 2.5 in. main piping diameter, 1.75 in. tail pipe diameter; Exits behind rear tire; Single inlet and dual outlet muffler configuration; Includes fully welded Superflow muffler for better volume efficiency, pipes, zinc plated 0.375-0.5 in. thick factory style hangers, heavy duty clamps, bolt kits, and dual 3 in. high polished T-304 stainless steel tips with round shape, angle cut, and non-rolled edge design; Features heavy duty aluminized mandrel-bent tubing to maintain constant exhaust flow for outstanding performance; Provides a powerful aggressive deep exhaust tone; Dyno tested to assure an increase in horsepower and torque; Improves fuel economy as engine become more fuel efficient; Easy clamp-on installation.