6.7 Cummins Turbo Back Exhaust

Why Does Your 6.7 Cummins Need a Turbo Back Exhaust?

Soot and Ash Buildup Choking the DPF

The factory diesel particulate filter on the 6.7L Cummins traps soot during every combustion cycle, then burns it off during active regeneration. Over tens of thousands of miles, ash that cannot be burned accumulates inside the filter substrate, gradually restricting exhaust flow and forcing the engine management system into more frequent, fuel-wasting regen cycles. A clogged DPF raises exhaust gas temperatures upstream of the turbo, shortens oil life, and leaves your truck sluggish when you need throttle response the most.

Thermal Fatigue from Regeneration Cycles

Every time the ECM commands a DPF regeneration, it dumps raw fuel into the exhaust stream to push internal temperatures above 1,100 degrees Fahrenheit. These extreme thermal spikes stress the turbocharger bearings, warp exhaust manifolds, and degrade the EGR cooler over repeated cycles. Deleting the DPF with a turbo back exhaust eliminates the regen cycle entirely, removing the heat source that cooks surrounding components under the hood of your Ram.

Stuck VGT Vanes from Carbon Deposits

The variable geometry turbo on the 6.7L Cummins uses movable vanes that adjust boost pressure across the RPM range. Carbon from EGR gases and incomplete DPF regenerations builds up on the vane mechanism, causing the vanes to stick. This triggers P2262 and P0046 turbo boost codes, loss of power, and erratic boost behavior. Opening up the exhaust path with a turbo back system lowers soot loading upstream and helps keep the VGT mechanism cleaner over the life of the turbo.

What Can a Turbo Back Exhaust Solve?

Lower Exhaust Gas Temperatures Under Load

A 5-inch mandrel-bent turbo back pipe flows significantly more volume than the factory 3.5-inch system. Reduced backpressure at the turbine outlet lets exhaust gases escape faster, which drops peak EGTs by 150 to 250 degrees during heavy towing. Cooler exhaust gas temperatures mean safer operating margins for the turbo, manifold gaskets, and cylinder heads.

Faster Turbo Spool and Sharper Throttle Response

With the restrictive DPF core and OEM muffler removed, the variable geometry turbo responds to throttle input faster. Drivers notice the boost gauge climbing quicker from a stop and the truck pulling harder through the midrange. This translates to better driveability whether you are merging onto the highway with a loaded trailer or climbing a grade at altitude.

Elimination of Active DPF Regeneration

Once the DPF is removed and a turbo back delete pipe is installed, the engine no longer enters active regeneration mode. This stops the uncommanded fuel dumping, the surging idle, and the excessive exhaust temperatures that characterize every regen event. Fuel economy improves because the engine stops burning extra diesel just to clean a filter that will eventually clog anyway.

Reduced Under-Hood Heat Soak

The factory DPF canister sits in the exhaust stream directly under the cab, radiating heat into the transmission tunnel, floor pan, and engine bay. Removing this massive heat sink with a turbo back pipe drops ambient under-hood temperatures, which benefits the transmission, intake air temperatures, and overall component longevity on your Ram 2500 or 3500.

Shop Turbo Back Exhaust by Cummins Engine & Fitment Guide

• 5" Turbo Back DPF Muffler Delete Pipe - Fits 6.7L Cummins in Ram 2500 / 3500 (2007.5 - 2012). Replaces the DPF, DOC, and muffler from the turbo outlet with a single 5-inch mandrel-bent T409 stainless pipe. Direct bolt-in fitment for the 2007.5 to 2009 and 2010 to 2012 model years, no cutting or welding required.
• 5" Turbo Back DPF Delete Pipe - Fits 6.7L Cummins in Ram 2500 / 3500 (2013 - 2018). Designed for the updated exhaust layout on 2013 to 2018 fourth-generation Ram trucks. Precision TIG-welded CNC flanges match the factory turbo V-band and tailpipe hanger locations. Covers the 2013 to 2015 early emissions revision and the 2016 to 2018 later revision under one part number.

Why Choose EGR Performance?

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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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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.

Will a turbo back exhaust fit my 6.7 Cummins?

Yes, the turbo back exhaust kits in this collection are designed for specific Ram 2500 and 3500 model years powered by the 6.7L Cummins.
The 2007.5 to 2012 kit fits the third-generation and early fourth-generation Ram trucks with the original DPF layout.
The 2013 to 2018 kit fits the later fourth-generation trucks that received an updated exhaust configuration.
Each kit uses precision CNC-machined flanges and factory-style hanger locations for direct bolt-in installation with no cutting or welding required.
Always verify your truck's model year and cab and bed configuration before ordering, and our 24/7 live support team can confirm fitment if you are unsure.

What is the difference between a 4-inch and 5-inch turbo back exhaust on a 6.7 Cummins?

The primary difference between a 4-inch and 5-inch turbo back exhaust comes down to sound character rather than a significant power gap.
A 4-inch pipe produces a sharper, growlier exhaust note with more pronounced turbo whistle, while a 5-inch pipe delivers a deeper, smoother rumble that many Cummins owners prefer.
Both diameters flow far more exhaust volume than the factory 3.5-inch system and will lower EGTs by a similar margin.
The 5-inch systems sold in this collection are the most popular choice among Ram 2500 and 3500 owners who want the classic deep Cummins tone.

Does a turbo back exhaust increase horsepower on a 6.7 Cummins?

A turbo back exhaust on a 6.7L Cummins improves exhaust flow by removing the restrictive DPF, DOC, and factory muffler.
This reduces backpressure at the turbine housing, which lets the variable geometry turbo spool faster and lowers peak exhaust gas temperatures.
On a truck that is also tuned and has the EGR deleted, owners commonly report improved throttle response and a noticeable bump in wheel horsepower.
The power gain comes from the combination of unrestricted exhaust flow and a performance tune working together, not just the pipe alone.

Can I install a turbo back exhaust myself on my Ram 2500 or 3500?

Most experienced DIY mechanics can handle a turbo back exhaust installation on a 6.7L Cummins in about two to four hours using basic hand tools and a floor jack or lift.
The process involves unbolting the factory exhaust from the turbo V-band clamp, dropping the DPF and muffler assembly, and bolting the new delete pipe into the factory hanger locations.
The kits include band clamps and gaskets so no welding is needed.
If you are not comfortable working under a heavy truck or lack the proper jack stands, any diesel shop can complete the install quickly.

Will a turbo back exhaust make my 6.7 Cummins louder?

Yes, a turbo back exhaust will make your 6.7L Cummins noticeably louder because it removes the DPF, DOC, and muffler that muffle the exhaust note on the factory system.
The 5-inch pipe in particular produces a deep, aggressive rumble at idle and a strong diesel tone under acceleration.
You will also hear more turbo whistle through the intake and exhaust, which is one of the most requested sound changes among Cummins owners.
If you prefer a more subdued tone, adding a straight-through muffler to the 5-inch system tames the highway drone while keeping the deeper character.

What does a turbo back exhaust replace on a 6.7 Cummins?

A turbo back exhaust replaces every component from the turbocharger outlet flange all the way to the tailpipe tip.
This includes the factory downpipe, the diesel oxidation catalyst, the diesel particulate filter, the selective catalytic reduction canister on 2013 and newer trucks, and the OEM muffler assembly.
The single mandrel-bent T409 stainless steel pipe bolts to the turbo V-band and routes exhaust gases straight out the back with no restriction.
All factory hanger points are retained so the new pipe sits in the original exhaust tunnel location.

Do I need a tuner to run a turbo back exhaust on my 6.7 Cummins?

Yes, you need a compatible diesel tuner to run a turbo back exhaust on a 6.7L Cummins because removing the DPF and related emissions sensors will trigger check engine codes and put the truck into a reduced power mode.
A DPF delete tune disables the regeneration cycle, clears the related fault codes, and recalibrates the engine management to run properly without the emissions equipment in place.
The tuner also allows you to adjust fueling and timing to take full advantage of the improved exhaust flow.

Will a turbo back exhaust improve fuel economy on a 6.7 Cummins?

Many 6.7L Cummins owners report a modest improvement in fuel economy after installing a turbo back exhaust, especially when paired with a tune.
The gains come from two sources: the engine no longer burns extra fuel during active DPF regeneration cycles, and the reduced exhaust backpressure lets the turbo operate more efficiently.
Typical improvements range from half a mile per gallon to one and a half miles per gallon depending on driving habits, load, and tune calibration.
The biggest fuel savings show up during sustained highway driving and heavy towing where the factory DPF regen cycles would consume the most extra fuel.

What is the difference between turbo back and downpipe back exhaust on a 6.7 Cummins?

A turbo back exhaust starts at the turbocharger outlet and replaces the entire exhaust system, including the downpipe, DPF, and muffler.
A downpipe back exhaust begins behind the factory downpipe and replaces everything from that point rearward.
On the 6.7L Cummins, a true turbo back system is what most owners want because the factory downpipe is integrated with the DPF inlet, so replacing from the downpipe back is effectively the same as turbo back on this platform.
The key distinction is that DPF-back systems only replace the section behind the DPF and keep all emissions equipment intact, which limits both sound and performance gains.

Are turbo back exhaust kits legal for street use on a 6.7 Cummins?

Turbo back exhaust kits that remove the DPF, DOC, and SCR emissions components are sold for competition and closed-course off-road use only.
Removing or bypassing factory emissions equipment violates EPA regulations and may be illegal for on-road use in your state or municipality.
EGR Performance sells these kits exclusively for off-road and competition applications, and the buyer is responsible for compliance with all local, state, and federal laws.
All products in this collection ship free within the United States, are covered by a one-year warranty against manufacturing defects, and qualify for our 45-day return policy if the part has not been installed.