6.7L Cummins 4" DPF & Cat Delete Race Pipe for 2018 Ram 2500

6.7L Cummins DPF & CAT Delete 4" Race Pipe for 2013-2018

This 6.7L Cummins 4" DPF & Cat delete race pipe is designed for 2013-2018 Dodge Ram 2500 and 3500 pickup models equipped with the 6.7L Cummins diesel engine. It replaces the most limiting mid-section exhaust components in the stock exhaust system, replacing the original exhaust path with DPF and CAT with a more direct and simpler 4" straight-through exhaust section.

It's suitable for users who:

• want to address the most restrictive parts of the stock DPF/CAT section first;
• want to reduce exhaust drag, but not necessarily to achieve a full turbo-back in one step;
• want to lay the foundation for future tuning or other upgrades;
• value performance release, modification potential, and budget control.

Compatibility Information

Compatible Models:

• 2013-2018 6.7L Cummins Dodge Ram 2500 / 3500 Pickup

Incompatible Models:

• Cab & Chassis
• Regular Cab

To avoid purchasing the wrong part, we recommend using the vehicle fitment checker on our page before placing your order. This will ensure a more accurate match of your year, model, and configuration, achieving approximately 100% fitment accuracy.

2mm Thickness + T409 Stainless Steel

This product is not a typical thin-walled replacement pipe; it is:

• Thickness: 2mm, more robust, providing better resistance to daily vibrations and long-term use.
• Material: T-409 Stainless Steel, more heat-resistant and corrosion-resistant than OEM-style aluminized pipes.

Optimize Vehicle Performance From the Root

The original 6.7L Cummins exhaust system was designed to meet emissions regulations, not performance. The DPF and catalytic converter, with their high-density honeycomb structure, are the largest sources of physical resistance, creating continuous high back pressure during engine operation.

This high back pressure causes three problems:

• Increased exhaust stroke resistance, reducing power output
• Excessive pressure behind the turbine, slowing turbo response
• Heat buildup, raising exhaust gas temperature (EGT)

Replacing it with a 4-inch straight-through race pipe reduces back pressure by over 60% and improves turbo response by 20-30%. Throttle feels more responsive, acceleration under load is smoother, and EGT drops by 100-150°F under heavy towing or climbing—protecting the turbo and engine.

Additionally, the factory DPF requires regeneration every 200-500 miles, costing $150-$300 annually in extra fuel and $500-$1500 in potential system repairs. Removing the DPF completely eliminates the regeneration process and avoids substantial repair expenses.

How to Choose: 4-inch Race Pipe vs. 4-inch Downpipe-Back Exhaust

The key difference between these two products isn't which is inherently better, but rather their different upgrade scopes and suitability for different users.

4-inch Race Pipe (This Product)

Replaces only the original DPF and catalytic converter, connecting the original turbo exhaust to the original mid-section and rear section. It retains the original muffler, resulting in a relatively restrained sound that isn't overly aggressive.

4-inch Downpipe-Back Exhaust

Starts from the turbo exhaust outlet (downpipe) and replaces the entire exhaust to the rear of the vehicle, including the mid-section and rear muffler. The exhaust path is completely replaced, resulting in the smoothest airflow and the most pronounced sound.

Easier Choice:

If you want to address the core limitations first and have a more budget-friendly option: Choose the 4" Race Pipe. If you want a more complete exhaust upgrade: Choose the 4" Downpipe-Back Exhaust.

Installation and Tuning

Simple Installation Steps

• Confirm vehicle year, model, body style, and engine compatibility.
• Lift the vehicle and ensure the exhaust system is fully cooled.
• Remove the original DPF + CAT section.
• Installate the 4" race pipe sections.
• Secure the connectors and mounting hardware.
• Check clearances, interface seals, and overall alignment.
• Start the vehicle and check for leaks, abnormal noises, or installation interference.

Tuning Requirements

These DPF & CAT delete race pipes are aftermarket parts that remove original emissions-related components; tuning is mandatory. Failure to perform the necessary tuning may result in:

• Fault codes
• Check Engine Light
• Vehicle malfunction
• Inability to achieve the desired performance after removal

Tuning Method: We recommend using mainstream diesel tuning equipment such as EZ Lynk.

This product does not include tuning equipment. Please ensure you already own or purchase the appropriate tuning tools before purchasing.