For 4"/5" 2011-2018 6.7 Cummins Cab & Chassis DPF Delete Exhaust

4" to 5" DPF Delete Race Pipe | 2011-2018 Ram 3500/4500/5500 6.7L Cummins (Cab & Chassis Only)

Keep your workhorse on the road, eliminate costly fleet downtime, and unlock the true towing power of your heavy-duty commercial rig. The SPEtuner 4" to 5" Downpipe-Back DPF Delete Race Pipe is precision-engineered exclusively for 2011–2018 Dodge Ram 3500, 4500, and 5500 Cab & Chassis models equipped with the 6.7L Cummins turbo diesel engine.

Crucial Vehicle Note: Cab & Chassis commercial trucks feature a completely different straight-rail frame layout, fuel tank positioning, and exhaust hanger geometry compared to standard pickup trucks. This kit is custom-fabricated to fit the unique Cab & Chassis chassis perfectly out of the box—no universal modifications, heavy cutting, or custom welding required.

Key Features

• Eliminate Costly Fleet Downtime & Limp Mode: Permanently bypass fragile NOx/soot sensors, DEF heaters, and clogged filters that leave your commercial work truck stranded on the job site in "Reduced Engine Power" mode.
• 4" to 5" High-Velocity Exhaust Flow: Transitions seamlessly from a 4-inch flange up to a massive 5-inch straight body, completely removing the restrictive, heavy factory DPF and SCR catalyst units.
• Drastically Drops EGTs Under Load: Essential for heavy towing, flatbeds, and dump trucks; dumping hot exhaust gases out instantly prevents thermal breakdown and protects your 6.7L engine components under constant stress.
• Sharpens Throttle Response: Eliminating extreme exhaust backpressure allows the Holset VGT turbocharger to spool up instantly, delivering instantaneous, usable low-end torque for moving heavy payloads.
• Maximizes Fuel Economy (MPG): Stopping the active, fuel-hungry DPF "regeneration" cycles saves your business gallons of raw diesel over time and increases overall fleet efficiency.

Performance Specifications

Here are more details about our muffler and Cat DELETE Pipe Kit:

• Made from Aluminized Steel/ T-409 Stainless Steel
• Thickness: 2mm
• Inlet Diameter: 4"/5"
• Get rids of restricting the cat pipe (catless, decat, test pipe)
• This Turbo-Back race pipe will allow removal of the catalytic converter, SCR, and DPF filter for off-road use. 

Why delete your 6.7L Cummins DPF?

By removing the restrictive 6.7 Cummins DPF delete pipe components, you unlock the full potential of your commercial rig:

• Significant MPG Increase: Improve from a clogged 13-14 MPG to an efficient 18-19 MPG combined.
• Zero Maintenance: Eliminates the need for expensive DPF cleanings and DEF fluid refills.
  
• Engine Longevity: Lower exhaust backpressure results in reduced engine strain and cooler operating temperatures.
• Power Gains: When paired with an ECU remap, expect massive torque improvements for heavy hauling.

Installation

DIY-Friendly Install: The install takes about 1 hour with basic hand tools done on the ground of your driveway or garage. Quicker if you have automotive style lift. Cutting may be required to fit shorter wheelbase bed/cab configurations. Clamps, hangers, and hardware are included. You may have to re-use some factory hardware.

Mandatory Tuner: This is a race-only exhaust. A DPF-delete capable tuner (e.g., EZ Lynk, Mini Maxx) is required to prevent Diagnostic Trouble Codes (DTCs) and Check Engine Lights.

FOR OFF-ROAD & COMPETITION USE ONLY. CHECK LOCAL EMISSIONS LAWS BEFORE PURCHASE.

Fitment

Note: This kit is designed for commercial-style chassis trucks. Standard pickup beds may require different hangers.

Frequently Asked Questions

Q1: Does this exhaust fit a standard Ram 2500 or 3500 pickup?

No. This product is designed specifically for 2011–2018 Ram 3500, 4500, and 5500 Cab & Chassis trucks with the 6.7L Cummins diesel engine. Cab & Chassis trucks use a different frame, fuel-tank arrangement, wheelbase, and exhaust-hanger layout from conventional pickup models. Confirm your truck configuration before ordering.

Q2: How can I tell whether my truck is a Cab & Chassis model?

A Cab & Chassis truck was originally supplied without a conventional factory pickup bed and is commonly fitted with a flatbed, service body, dump body, tow body, or other commercial upfit. A pickup that simply had its original bed replaced is not automatically a Cab & Chassis model. Check the VIN and factory vehicle configuration if you are unsure.

Q3: Which option should I choose for my truck?

The 4-inch aluminized-steel option is a downpipe-back configuration listed for 2013–2018 applications. The 5-inch T409 stainless-steel option is a turbo-back configuration listed for 2011–2018 applications. Match the option to your model year, existing exhaust connection point, desired pipe diameter, and operating environment before ordering.

Q4: What is the difference between downpipe-back and turbo-back?

A downpipe-back system connects behind the existing downpipe, while a turbo-back system replaces more of the exhaust path beginning near the turbocharger outlet. Because the included parts and installation steps differ, inspect your current exhaust layout and confirm the selected variant before purchase.

Q5: Is a tuner or EGR delete kit included?

No. This listing is for the selected exhaust-pipe configuration and its supplied installation hardware. A tuner, EGR hardware, and other electronic or emissions-system components are not included unless they are specifically shown in the selected variant’s contents.

Q6: Do you offer a more complete package?

Yes. Buyers who need a coordinated exhaust, EGR, and tuning package can consider the 2011–2018 6.7 Cummins Cab & Chassis Delete Bundle. Compare its included components and fitment with your truck before ordering. It is intended only for applications and locations where this type of modification is permitted.

Q7: Will installation require cutting or welding?

The system is designed around the Cab & Chassis layout, but these trucks can have different wheelbases, commercial bodies, tanks, and previous exhaust modifications. Pipe trimming or adjustment may be required on some configurations. Welding is not normally the intended installation method, but a professional installer should inspect modified or nonstandard trucks.

Q8: Are clamps, hangers, and installation hardware included?

The system includes the hardware supplied for the selected configuration, but some factory hardware may need to be reused. Compare the received parts with your truck before removing the original exhaust, and do not begin installation if anything required for your configuration is missing.

Q9: Should I choose aluminized steel or T409 stainless steel?

Aluminized steel offers a lower-cost option for relatively dry operating conditions. T409 stainless steel generally provides better corrosion resistance for trucks exposed to rain, winter roads, road salt, mud, or frequent commercial use. T409 can develop surface discoloration without losing its underlying corrosion-resistant properties.

Q10: Will this product guarantee better MPG or eliminate warning lights?

No specific fuel-economy improvement or warning-light outcome can be guaranteed. Results depend on vehicle condition, calibration, gearing, payload, idle time, driving cycle, installation quality, and other modifications. Existing diagnostic problems should be identified before parts are replaced.

Q11: Is this product suitable for towing and commercial work trucks?

The Cab & Chassis-specific routing is intended for heavy-duty platforms commonly used with flatbeds, service bodies, dump bodies, and tow equipment. Fitment still depends on the truck’s exact wheelbase, body upfit, tank placement, and previous modifications. This product does not change the vehicle’s factory tow or payload rating.

Q12: Can this exhaust be used on public roads?

his product is intended only for off-road or competition applications where the modification is permitted. Removing or disabling emissions equipment may violate federal, state, provincial, or local law and may affect registration, inspection, warranty, or resale. Verify all applicable requirements before purchase or installation.