fits: 2004 Dodge Cummins Crew cab short bed Part Number: MBRS6104AL Type Of System: Turbo Back Tube Size: 4in. Retains Catalytic Converter: No Type Of Material: Aluminized Steel Outlet Type: Single Exit Location: Side Exhaust Tip: Stainless Steel Tip Size: 5in. Muffler Included: Yes Muffler Type: Straight Through Muffler Material: Aluminized Mounting: Reuses Factory Hangers Value Without Compromise, Installer Series from MBRPinc brings you the best of both worlds. Designed and constructed to the exact same specifications as MBRPinc's Pro Series you can expect the same improvements in torque and horsepower and the same awesome sound as our top of the line products. The difference is the heavy duty aluminized steel construction saves you money without compromising on performance. As aluminized goes MBRPinc's truly is superior to many other similar products on the market. Heavy sixteen gauge is one reason, another is that our systems have a thick protective coating of aluminum silica on the seams - an area that is often left exposed to rust. We are so certain of our Installer Series products that we back them with an industry leading 3 Year Warranty.