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ATLAS DPF-Back Exhaust System with Dual Tips (49-03065-P) by aFe. Exhaust Type: DPF-Back. Tubing Diameter: 4in. The ATLAS Exhaust System channels the exhaust from the engine to the rear of the vehicle on a racing diesel engine truck. It has the least amount of exhaust flow restriction possible to enable the engine to make more horsepower and torque and operate with reduced exhaust gas temperatures.