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Dual Stainless SteelCat-Back Full Exhaust System by Injen. Torque Gain: +15 lbs. x ft.. Includes: Muffler and Dual Burnt Titanium Tips. Main Piping Diameter: 76mm. The perfect complement to your Injen air intake system is an Injen performance exhaust system. Each exhaust system is dyno-tuned together with the air intake system to achieve maximum horsepower and torque across the power band.