6.7 Cummins Muffler Delete Pipe

Why Does Your 6.7 Cummins Need a Muffler Delete Pipe?

Rusting, Cracked Factory Resonator Hangers and Condensation Corrosion

The stock muffler on the 6.7L Cummins is a straight-through resonator, not a true muffler. Its job is to cancel cabin drone, not to reduce exhaust volume. The problem is that condensation from short trips and cold starts pools inside the resonator shell and rots it from the inside out. The factory spot-welded hangers fatigue and crack under the vibration of heavy towing and off-road driving. Once the hanger breaks, the resonator sags, stresses the downstream exhaust clamps, and eventually splits at the inlet or outlet seam. A T304 stainless steel or aluminized steel muffler delete pipe eliminates this rust-prone component entirely and replaces it with a solid, mandrel-bent tube that will not degrade.

Restricted Exhaust Flow and Sluggish Turbo Response

Even though the factory resonator is straight-through, it still introduces a slight restriction in the exhaust path. The perforated core tube inside the resonator creates turbulence, and the packing material around it adds volume that disrupts smooth gas flow. On a deleted truck running higher boost and fueling, that restriction becomes noticeable as slower turbo spool, higher exhaust gas temperatures under sustained load, and a flat spot in the mid-range power band. Replacing the resonator with a straight muffler delete pipe removes the turbulence zone and gives the exhaust gases a clean, unobstructed path from the DPF or downpipe to the tailpipe.

Muffled Turbo Whistle and Undetectable Exhaust Leaks

The factory resonator absorbs a significant portion of the turbo whistle and exhaust tone that Cummins owners want to hear. On trucks that still have the DPF and SCR system in place, the resonator further dampens an already quiet exhaust note, making it difficult to detect early exhaust leaks, boost leaks, or turbo bearing wear by sound alone. Installing a muffler delete pipe opens up the exhaust note enough to hear the turbo spool, monitor engine tone under load, and catch exhaust leaks before they become expensive failures.

What Can a Muffler Delete Pipe Solve?

Eliminate the Rust-Prone Factory Resonator

Replace the rotting factory resonator with a solid T304 stainless steel or aluminized steel straight pipe that will not corrode, crack, or degrade. The delete pipe bolts directly to the factory exhaust clamps and hanger locations, so the installation takes under an hour with no welding.

Reduce Exhaust Backpressure and Lower EGTs

By removing the restrictive perforated core and packing material inside the factory resonator, exhaust gases flow freely through a smooth-bore mandrel-bent tube. This reduces backpressure at the turbo outlet, which translates to faster turbo spool, lower exhaust gas temperatures during sustained towing, and a cleaner running engine under load.

Open Up the Exhaust Note and Turbo Sound

A muffler delete pipe lets the natural Cummins exhaust tone come through without the drone-canceling absorption of the factory resonator. The result is a deeper, more aggressive exhaust note that lets you hear turbo spool, monitor engine tone, and detect problems early by sound.

Shop Muffler Delete Pipe by RAM Cummins Engine & Fitment Guide

• 4" DPF EGR DEF Delete Kit with Diesel Muffler - Fits 6.7L Cummins in Dodge Ram 2500 3500 (2010-2014). Full delete package with T304 stainless steel muffler delete section, DPF race pipe, EGR cooler bypass, and DEF system delete components for the 2010-2012 and 2013-2014 generation 6.7L Cummins trucks.
• 4" DPF EGR DEF Muffler Delete Pipe Kit - Fits 6.7L Cummins in Dodge Ram 2500 3500 (2010-2014). Mandrel-bent 4-inch aluminized steel muffler delete pipe paired with the DPF race pipe and EGR delete components for the early and mid-generation 6.7L Cummins exhaust systems.
• 4" Diesel Muffler - Fits 6.7L Cummins in Dodge RAM 2500 3500 (2010-2019). Standalone 4-inch high-flow diesel muffler designed to replace the factory resonator across the full range of 4th gen Ram 2500 and 3500 trucks, from the 2010-2012 non-DEF generation through the 2013-2019 SCR-equipped generation.
• 5" Turbo Back DPF Muffler Delete Pipe - Fits 6.7L Cummins in Ram 2500 3500 (2007.5-2012). Full 5-inch turbo-back exhaust system with DPF delete race pipe and integrated muffler delete section for the early 6.7L Cummins 2007.5-2009 and 2010-2012 model years before the SCR emissions system was introduced.
• 4" DPF Pipe EGR Delete Tuner Kit - Fits 6.7L Cummins in Dodge Ram 2500 3500 (2010-2014). Complete kit combining the 4-inch DPF delete pipe with muffler, EGR cooler delete, and a race tuner for the 2010-2012 and 2013-2014 generation Cummins trucks that require ECM recalibration for deleted operation.
• 4" DPF EGR Delete Pipe Kit - Fits 6.7L Cummins in Dodge Ram 2500 3500 (2010-2014). 4-inch aluminized steel DPF race pipe with EGR cooler bypass kit for the 2010-2014 generation 6.7L Cummins, designed to replace the factory DPF canister and EGR system while maintaining the stock muffler delete section.
• 4" DPF EGR Delete Muffler Pipe Kit - Fits 6.7L Cummins in Dodge Ram 2500 3500 (2010-2014). Combines the DPF race pipe, EGR cooler delete, and a dedicated muffler delete pipe section into one package for the 2010-2012 non-SCR and 2013-2014 SCR generation 6.7L Cummins trucks.
• 4" DPF EGR DEF Delete Tuner Muffler Pipe Kit with CCV Reroute - Fits 6.7L Cummins in Dodge Ram 2500 3500 (2010-2014). Full delete package including 4-inch DPF race pipe with muffler, EGR delete, DEF system delete, CCV crankcase ventilation reroute, and race tuner for the complete 2010-2014 generation Cummins emission system removal.
• 4" DPF EGR DEF Delete All In 1 with Muffler - Fits 6.7L Cummins in Dodge Ram 2500 3500 (2010-2014). All-inclusive delete kit combining DPF race pipe, EGR cooler delete, DEF delete, integrated muffler section, and all necessary hardware for the 2010-2014 generation Ram 2500 and 3500 trucks powered by the 6.7L Cummins turbodiesel.

Why Choose EGR Performance?

The industry standard for high-performance diesel reliability.

Premium Quality & Rigorous Testing

Our EGR, DPF, and CCV delete kits are engineered from premium-grade materials and subjected to brutal quality control and field testing. Unlike generic alternatives, our products are built to withstand extreme heat and pressure, delivering unmatched durability and long-term stability when your rig needs it most.

20 Years of Proven Diesel Expertise

We aren't just selling parts. We live in this industry. With two decades of hands-on experience providing specialized modification solutions for heavy-duty truck owners, our upgrades have been extensively proven across every driving environment, from daily towing to high-performance tracks.

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We work hand-in-hand with top-tier industry partners and reputable organizations. Every product we design, test, and ship meets or exceeds strict industry standards, ensuring your Powerstroke, Cummins, or Duramax gets the exact precision it deserves.

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Thousands of diesel owners trust us to unlock their engine's true potential. Our massive library of positive customer feedback and successful build case studies proves one thing: our kits deliver real horsepower, lower EGTs, and flawless reliability in the real world.

What does a muffler delete do on a 6.7 Cummins?

A muffler delete on a 6.7 Cummins removes the factory resonator, which is a straight-through device designed to cancel cabin drone, and replaces it with a solid section of mandrel-bent T304 stainless steel or aluminized steel exhaust tubing. This eliminates the restrictive perforated core and packing material inside the factory resonator, opening up the exhaust flow path and reducing backpressure at the turbo outlet.

The result is faster turbo spool, a deeper and more aggressive exhaust note, and lower exhaust gas temperatures under sustained load. The delete pipe bolts directly to the factory exhaust clamps and hanger locations, so installation takes under an hour with basic hand tools and no welding.

Will a muffler delete make my 6.7 Cummins louder?

Yes, but the change is more noticeable on trucks that have already had the DPF and SCR systems removed. On a stock emissions-equipped truck, the DPF canister and SCR catalyst absorb a significant amount of exhaust volume, so removing only the muffler will produce a deeper tone and more turbo whistle but not a dramatic volume increase.

On a fully deleted truck with a race tuner, the muffler delete pipe opens up the exhaust considerably. You will hear the turbo spool, the natural Cummins engine tone under acceleration, and a deeper idle rumble. The change is noticeable but still daily-driver friendly compared to a full straight-pipe setup.

Is the factory muffler on the 6.7 Cummins actually a muffler?

No. The factory unit is technically a resonator, not a muffler. It uses a straight-through perforated core tube wrapped in sound-absorbing packing material, designed specifically to cancel cabin drone frequencies rather than reduce overall exhaust volume.

Because it is a passive device with no baffles or chambers, it creates only a minor restriction in exhaust flow. However, the casing is prone to internal condensation corrosion, the spot-welded hangers fatigue and crack under vibration, and the packing material degrades over time. A muffler delete pipe eliminates all of these failure points.

How long does it take to install a 6.7 Cummins muffler delete pipe?

Most muffler delete pipe installations on the 6.7 Cummins take 30 to 60 minutes using basic hand tools: a socket set, a pry bar, and possibly a sawzall if the factory clamps are seized. The delete pipe is designed to slip directly into the factory exhaust system using the OEM clamp locations and hanger positions.

No welding is required. You simply loosen the two exhaust clamps on either side of the factory resonator, slide the resonator off its hangers, and slide the delete pipe into position. Re-clamp both connections, double-check alignment, and you are done. EGR Performance includes all necessary hardware with every kit.

What size muffler delete pipe do I need for my 6.7 Cummins?

The 6.7L Cummins exhaust systems use either a 4-inch or 5-inch diameter, depending on the model year and whether the truck has a stock or aftermarket exhaust system. The 2007.5 through 2018 Ram 2500 and 3500 trucks typically run a 4-inch system from the factory, while the 2019 and newer trucks and aftermarket turbo-back systems often use a 5-inch diameter.

Measure the outer diameter of your existing exhaust pipe at the resonator location before ordering. EGR Performance carries muffler delete pipes in both 4-inch and 5-inch configurations, each mandrel-bent from T304 stainless steel or heavy-gauge aluminized steel to match your existing system.

Does a muffler delete improve performance on a 6.7 Cummins?

A muffler delete pipe alone provides modest performance gains: slightly reduced backpressure, marginally lower exhaust gas temperatures, and a small improvement in turbo response. The gains are most noticeable when the delete pipe is paired with other modifications such as a DPF delete, EGR delete, and a race tuner.

On a fully deleted and tuned truck, the muffler delete pipe completes the unrestricted exhaust path from the turbo to the tailpipe. The combined effect of removing the DPF, EGR, and resonator delivers measurable horsepower and torque increases, lower EGTs under heavy load, and faster turbo spool throughout the RPM range.

Can I do a muffler delete without deleting the DPF or EGR on my 6.7 Cummins?

Yes. The muffler delete pipe is an independent component that sits downstream of the DPF and SCR system. You can install it on a fully stock emissions-equipped truck without touching the DPF, EGR, DEF, or any other emissions hardware. The installation does not require any tuning changes.

On a stock truck, the muffler delete will produce a slightly deeper exhaust tone and more turbo whistle. The performance gains will be minimal because the DPF and SCR system are the primary restrictions in the exhaust path. For maximum benefit, the muffler delete works best as part of a full delete package with a race tuner.

Will a muffler delete cause exhaust drone in the cabin of my Ram 2500?

Most 6.7 Cummins owners report that a muffler delete pipe produces a deeper exhaust tone without objectionable cabin drone. The factory resonator was designed to cancel specific drone frequencies, so removing it can introduce some drone at certain RPM ranges, particularly around 1800 to 2200 RPM during highway cruising or steady-state towing.

The severity depends on your full exhaust configuration. On a truck with the DPF and SCR still in place, drone is minimal because those components absorb significant sound energy. On a fully deleted truck with a straight-pipe exhaust, drone is more pronounced. If drone becomes an issue, a high-flow performance muffler can be installed downstream of the delete pipe.

What is the difference between a muffler delete and a straight pipe on a 6.7 Cummins?

A muffler delete replaces only the factory resonator section with a straight pipe, leaving the rest of the exhaust system intact. It is a targeted, single-component swap that takes under an hour and does not require tuning changes on a stock truck.

A straight pipe setup removes the DPF, SCR catalyst, and resonator, replacing the entire exhaust system from the turbo outlet to the tailpipe with unobstructed tubing. This requires a race tuner to recalibrate the ECM for the missing emissions components and is significantly louder and more involved. The muffler delete is the simpler, more affordable option that still delivers meaningful flow improvements and sound changes.

Is a 6.7 Cummins muffler delete legal for street use?

The legality of a muffler delete depends on your local jurisdiction. Removing only the factory resonator and replacing it with a straight pipe is generally less scrutinized than removing emissions equipment such as the DPF, EGR, or SCR system. However, some states and municipalities have noise ordinances that require a functioning muffler on all vehicles operated on public roads.

Products in this collection are designed and sold for competition and closed-course off-road use only. Removal of any emissions component, including DPF, EGR, SCR, or DEF systems, is a violation of federal law under the Clean Air Act for vehicles operated on public highways. EGR Performance offers free shipping on all orders, a 1-year warranty against manufacturing defects, and a 45-day return policy so you can verify fitment and quality before installation. Check your local and state regulations before modifying your exhaust system.