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Gibson Diesel Extreme Dual Exhaust Systems feature proven performance increases, as much as 15 horsepower gains and 30 Ft/Lbs of increased torque. These improvements are brought together with its unique design that also delivers improved and more aggressive exhaust sound. Each of these exhaust systems is made with large 3 inch mandrel-bent tubing, Superflow TM Mufflers, stainless steel tips, zinc plated factory style hangers and heavy-duty clamps. They have their exits behind the rear tires at an angle.