Gibson Single Side Exhaust is perfect for improved acceleration, maximum hill climbing, towing and passing power. This is our best performing Exhaust System. Exits behind the rear tire. Quieter in the cab than any other Performance Exhaust. Dyno test results show it makes maximum torque and horsepower at low-end (1800 to 3000 RPM) with gains of 5-7hp and as much as 20 foot pounds of torque. . Hassle free, bolt-on installation with professional looking results. No welding required. Backed by a Lifetime Limited Warranty.