2013-2018 6.7L Cummins 4" Downpipe-Back CAT/DPF Delete Exhaust System For Ram 2500/3500

2013-2018 6.7 Cummins DPF Delete Downpipe-Back Exhaust

This 4-inch DPF delete downpipe-back exhaust system is designed for the 2013-2018 Dodge Ram 2500/3500 equipped with the 6.7L Cummins engine. A downpipe-back exhaust system replaces the exhaust components from the downpipe rearward rather than replacing the entire exhaust path from the turbo outlet. This format is typically used when the front-side turbo connection is not being replaced, while the mid-pipe and rear sections are updated.

As a mainstream and preferred option for diesel vehicle modifications, this product requires no modification to the turbocharger, making installation simpler and less expensive, while unleashing 80%-90% of the performance potential of a turbo-back exhaust system.

Why Choose a 4" Downpipe-Back System?

For most 6.7L Cummins owners, the Downpipe-Back system represents the "smartest upgrade path":

• ✅ Precisely targets bottlenecks: The most congested part of the stock exhaust is the mid-to-rear section where the DPF, CAT valves, and muffler are located. Replacing these solves 80% of the exhaust resistance problem.
• ✅ Low installation complexity: No need to touch the confined space and high-temperature components near the turbocharger outlet; installation time and difficulty are significantly lower than with a Turbo-Back system.
• ✅ Maximizes cost-effectiveness: Eliminates the cost of complex piping at the turbocharger end, achieving most of the performance improvement with less investment.
• ✅ Immediate results: Once started, you'll immediately feel a smoother exhaust, more responsive throttle, and a deeper, more powerful sound.

It's not the most comprehensive, but it's the most suitable for most people.

Key Benefits – What Will You Get After the Upgrade?

1. Reduced Exhaust Back Pressure

Removing the dense mesh structure of the DPF and muffler allows high-temperature exhaust gases to escape quickly without any airflow obstruction, fundamentally solving the problem of excessive exhaust back pressure.

2. Unlock a Deep, Resonant Diesel Sound

Removing the original muffler unlocks the unique deep, resonant diesel sound of the 2013-2018 6.7L Cummins exhaust, paired with a clear turbo whistle. The sound is full and not harsh, providing a more immersive driving experience than the original exhaust, without being as aggressive or disruptive as a 5-inch or turbo-back exhaust.

3. High-Value Full System Upgrade

As a complete exhaust upgrade kit including the mid-section and tailpipe, it is priced lower than a full turbo-back exhaust system, with lower installation costs. Upgrading alone can achieve multiple improvements in performance, sound, and fuel economy, making it an excellent choice for a low-cost diesel vehicle upgrade.

4. Reduce Long-Term Vehicle Costs

Removing the DPF completely eliminates the ongoing maintenance costs of the original emissions system: no need for $500-$1000/50,000 miles for DPF cleaning, no need for $3000+ DPF replacement costs, and no ongoing expenses for DEF urea solution; at the same time, engine combustion efficiency improves by 4%-6%. Based on 300,000 miles and $5.00/gallon diesel, the cumulative fuel savings are approximately $21,000, with total savings of up to $27,200. Even after deducting the cost of the kit, the net savings can still reach $26,000.

Applicable Models

Applicable:

• 2013-2018 Dodge Ram 2500/3500 models with a 6.7L Cummins diesel engine

Not Applicable

• 2500 with air-ride
• regular cab
• Cab & Chassis

Installation Notes

Downpipe-Back vs Turbo-Back

This system is significantly simpler to install because it eliminates the need to replace the downpipe at the turbo outlet. It primarily involves the removal and reconfiguration of the mid-to-rear piping, typically completed in 1-2 hours on a professional lift.

Professional Installation Recommendations

Although the installation is relatively simple, we strongly recommend that it be performed by an experienced exhaust technician to ensure all clamp connections are tightly sealed to prevent leaks and to confirm that all suspension hangers are correctly positioned.

Tuner Required

After removing emission control devices such as the DPF, a compatible DPF removal tuner must be used for ECU programming to disable fault codes and optimize fuel injection to fully utilize the hardware's performance.