DPF-Back Exhaust Systems for Diesel Trucks

DPF-Back Exhaust Systems for Diesel Trucks

DPF-back exhaust systems connect at the outlet of the diesel particulate filter and replace the muffler and tailpipe section to reduce backpressure after the DPF while keeping the emissions equipment intact. This makes DPF-back systems the emissions-legal exhaust upgrade for diesel trucks in areas where removing or bypassing the DPF is prohibited.

Popular Upgrades

Stainless steel DPF-back exhaust systems for the Ram 2500 and 3500 Cummins 6.7L, Ford Super Duty Power Stroke 6.7L, and GM Duramax 6.6L are the most popular diesel truck exhaust upgrades in this category. Mandrel-bent 4-inch DPF-back systems provide a significant reduction in exhaust restriction compared to the factory 3.5-inch outlet, resulting in improved exhaust gas temperature management and modest power improvements. Tip styles including rolled edge, angle cut, and dual outlet tips allow customization of the exhaust appearance to match the truck's styling.

What is the difference between a DPF-back and a turbo-back exhaust?

A DPF-back system connects at the DPF outlet and retains the catalytic converter and DPF, making it emissions legal for street use in most jurisdictions. A turbo-back system removes from the turbocharger downpipe forward through the DPF, eliminating all emissions equipment for maximum flow. Turbo-back systems offer greater power potential but are generally only legal for off-road or race-only applications, and many states actively enforce this.

Will a DPF-back exhaust affect diesel emissions testing?

A properly installed DPF-back system that retains the OEM DPF, EGR, and SCR components intact does not affect emissions compliance. The DPF-back section downstream of the DPF is not tested during OBD-based emissions inspections. Physical inspection states may flag aftermarket tips or unusual exhaust routing, so confirm your state's specific visual inspection criteria before purchasing a DPF-back system.

Find diesel exhaust upgrades at Black Ops Auto Works. Browse our full exhaust systems, air intake systems, and suspension upgrades for your diesel build.