Performance Series Diesel Exhaust System by MBRP. Series: Performance Series. Exhaust Pipe Material: Aluminized Steel. Main Piping Diameter: 4in. Muffler Sound: Moderate. Exit Location: Single Side Exit. Includes: Aluminized Downpipe. Get more out of your turbodiesel pickup with a Performance Series exhaust system from MBRP. Get more power, more torque, more fuel economy and more of that sweet big-motor burble. these value-priced exhaust systems will scavenge more spent exhaust gases than the stock system. AUTOMATIC TRANSMISSION ONLY