Upgrading vehicle's exhaust system is a great way to build horsepower, free up trapped torque, and improve upon restrictive factory systems. The larger pipes, low-restriction mufflers, and tuned resonators of a well-designed performance exhaust system can make a world of difference on your vehicle. The net result is lower auto exhaust backpressure, more horsepower, more torque, and a much better sound Made of High Quality Stainless Steel with Computerized Mandrel-Bends for Strength and Durability Piping Inlet Size: 2.5" OD Major Piping Diameter: 2.5" OD Quad 4" Double Walled Round Diagonal Cut Tip Eliminates Factory Style Mufflers; Slip On Fit Design