The Pros and Cons of Deleting Your 6.7 Cummins Engine

Let's break it down. When you delete your 6.7 Cummins, you're removing three major emissions control systems that Ram installed to meet federal EPA regulations^[1].

The DPF (Diesel Particulate Filter) traps soot and requires periodic regeneration cycles where your truck burns extra fuel to clean the filter. These regen cycles consume 2-4 MPG every time they kick in^[2].

The EGR (Exhaust Gas Recirculation) system recirculates exhaust gases back into your combustion chamber to reduce emissions. Problem is, it also creates backpressure that restricts exhaust flow and contaminates your oil with soot^[2].

The SCR/DEF System uses diesel exhaust fluid — a purified urea and water mix — to chemically reduce nitrogen oxides. If your DEF runs low or gets contaminated, your truck goes into government-mandated limp mode. Contaminated DEF can cost thousands to repair^[1].

Here's what most people don't realize: you can't just yank these parts out. Simply removing components without reprogramming your engine control module will throw check engine lights and put your truck into limp mode. A proper delete requires professional ECM tuning to accommodate the removed equipment and optimize your combustion parameters^[1].

One of the main reasons truck owners delete their 6.7 Cummins is the power bump — and it's real. When you remove those emissions control systems, you're freeing your engine from restrictions that limit airflow and turbo efficiency.

The gains depend on what you delete and how well your tuner optimizes the ECM. A standard full delete with quality components typically delivers 30-80 HP^[1]. More comprehensive setups with aggressive tuning can push 75-150+ HP^[2]. Even if you're just removing the DPF and EGR, you'll see 15-20 HP from reduced backpressure alone^[2].

Here's why the power comes: removing the DPF and EGR lets your turbocharger operate more effectively. Your stock EGR system recirculates exhaust back into the intake, which contaminates oil through crankcase ventilation — a common issue in factory configurations^[2]. Deleting eliminates that contamination cycle and lets your turbo breathe.

The variation in power gains comes down to whether you do a partial delete (just DPF or EGR) or a full delete (all three major systems)^[1]. Full deletes paired with quality tuning deliver the biggest bang for your buck.

The bottom line? Depending on the extent of your delete, you could see anywhere from 20-100+ horsepower gains — and you'll feel every bit of it when you're towing or passing on the highway.

This surprises people, but deleting your 6.7 Cummins can actually save you money on fuel. Here's how it works.

Your DPF regeneration cycles are fuel hogs. Every time your truck performs a regen to burn off trapped soot, it's consuming 2-4 MPG of diesel^[2]. These cycles happen frequently under heavy use — towing, city driving, short trips. Eliminating the DPF means eliminating those fuel-hungry regen cycles, which improves fuel economy by 10-15% right off the bat^[2].

Real-world users report 1-3 MPG gains after a proper delete^[1]. That might not sound massive, but do the math: if you're running 15,000 miles a year at current diesel prices, those 2 extra MPG add up to hundreds of dollars saved annually.

Removing the emissions systems also decreases overall vehicle weight and frees up space under the hood. Less weight means your truck requires less fuel to operate — basic physics. Your engine runs more efficiently without the backpressure restrictions from the EGR choking airflow.

Here's the context: modern emissions-equipped 6.7 Cummins trucks can already hit 20+ MPG on the highway with proper driving^[1]. So while the fuel economy gains are real, they're not transformative — you're looking at moving from 20 MPG to 22-23 MPG, not doubling your efficiency.

For owner-operators and guys who rack up serious miles towing heavy loads, those 2-3 MPG matter. For weekend warriors, the savings are nice but not game-changing.

Let's talk about what you're NOT dealing with anymore once you delete your 6.7 Cummins. This is where the long-haul value really shows up.

No More DPF Clogs
Your diesel particulate filter traps soot, and eventually it gets clogged. When that happens, you're looking at forced regens, reduced power, check engine lights, and eventually a trip to the dealer for cleaning or replacement. DPF replacement can run $2,000-$3,000+ depending on your year and labor costs. Delete it, and that problem disappears.

No More EGR Failures
EGR coolers and sensors are notorious for failing on the 6.7 Cummins. The cooler cracks, the valve sticks, the sensors throw codes — it's a constant headache. Removing the EGR system eliminates all those potential failure points.

No More DEF System Issues
Diesel exhaust fluid contamination is expensive to fix. If your DEF gets contaminated or your SCR system fails, you're looking at thousands in repairs. Delete the SCR, and you never have to worry about DEF quality, freezing, or running dry and getting stuck in limp mode^[1].

For trucks that tow heavy, run off-road, or rack up high mileage, deleting can genuinely extend engine life. You're eliminating systems that add stress, heat, and complexity to your powerplant. Your oil stays cleaner without EGR contamination. Your turbo runs cooler without regen cycles spiking exhaust temps.

The maintenance simplification is real — and it's one reason so many fleet operators and commercial haulers consider deletes despite the legal risks.

Here's where things get serious. Let's be crystal clear: removing factory-installed emissions equipment is a federal violation under EPA law^[1]. This isn't a gray area. It's illegal across all 50 states, whether your state has emissions testing or not.

Warranty Voidance
The second you delete your 6.7 Cummins, you void your factory powertrain and emissions warranty^[2]. Dealers aren't stupid — they can detect deletions even if you reinstall the hard components before service. The tuning evidence stays in your ECM, and diagnostic scans will reveal the modification^[1].

Emissions Testing Failures
If you live in a state with emissions testing, your deleted truck will fail. Period. You won't be able to register it legally^[2].

Federal Penalties
The EPA has been cracking down on delete kit manufacturers and installers. While individual truck owners rarely face enforcement, the legal exposure is real. Full deletes carry the highest potential for fines if you're ever targeted^[1].

Resale Complications
Try selling a deleted truck in a regulated state, and you'll find out real quick how much it limits your buyer pool. Some buyers won't touch deleted trucks because of the legal baggage and inspection issues.

Look, we get it — plenty of guys run deleted trucks without issues, especially in rural areas or states without testing. But you need to go into this with eyes wide open about the legal risks you're taking on.

Let's not dance around this one. Deleting your emissions systems makes your truck pollute more. That's just physics.

The DPF, EGR, and SCR systems aren't there to annoy you — they exist because diesel engines produce harmful pollutants. Nitrogen oxides, particulate matter, soot — all that stuff that's bad for air quality and human health. These emissions systems reduce those pollutants significantly.

When you remove them, your truck goes back to producing unrestricted emissions. More black smoke. More NOx. More particulate matter in the air. The systems you deleted were specifically engineered to capture and reduce these pollutants before they exit your tailpipe.

Now, we're not here to preach. Every truck owner has to make their own call about what matters to them. But it's worth understanding what you're contributing to when you delete. In urban areas with air quality issues, diesel emissions are a real concern. In rural areas, the impact is more diffuse.

The EPA regulations exist because diesel emissions have measurable health impacts — respiratory issues, cardiovascular problems, environmental degradation. Whether those concerns matter more or less than your truck's performance is a personal decision, but you should at least know what's on the other side of the scale.

Let's talk money. What's it actually cost to delete your 6.7 Cummins?

Complete delete kits typically range from $800 to over $2,000^[2]. Here's what drives the price variation:

• Component Quality: Cheap eBay kits use thin materials and basic hardware. Quality kits like ours use mandrel-bent stainless steel and American-made components that'll last the life of your truck.
• Tuning Sophistication: Budget tuners offer basic delete tunes. Professional-grade tuners optimize your ECM for maximum power, drivability, and reliability — that costs more.
• What's Included: Full bundles include DPF delete pipes, EGR delete kits, tuners, and all necessary hardware. Partial kits require you to source components separately.
• Labor Costs: DIY installation saves money but requires mechanical skill. Professional installation adds $300-$800 depending on your area and shop rates.

Here's a realistic breakdown for a quality full delete on a 2013-2018 Ram 6.7 Cummins:

Our Ram Cummins 6.7 Full Delete Bundles package everything you need at competitive pricing with quality American-made components. You're looking at $1,500-$2,000 for a complete setup that'll deliver real gains and last the long haul.

Yeah, it's an investment. But when you factor in the fuel savings, maintenance costs avoided, and performance gains, many owners break even within 2-3 years of heavy use.

So here's where we land after looking at all the angles.

The Case FOR Deleting:
Real power gains of 30-150 HP. Legitimate fuel economy improvements of 1-3 MPG. Elimination of expensive maintenance headaches from DPF, EGR, and DEF failures. Cooler exhaust temps and cleaner oil. For trucks that tow heavy, run commercial routes, or see serious off-road use, these benefits add up to real value.

The Case AGAINST Deleting:
It's federally illegal, period. Your warranty gets voided immediately. You can't pass emissions testing in regulated states. You're increasing pollution output substantially. Modern emissions-equipped 6.7 Cummins trucks already deliver excellent performance — 20+ MPG highway and plenty of power for most uses^[1].

Industry experts like MotorTrend are clear: "To put it bluntly, no, you should not remove the emissions equipment from any diesel pickup."^[1] They argue that modern trucks perform well enough stock, tuners can achieve significant power with emissions intact, and legal/environmental risks outweigh marginal gains.

Here's our take: we're not here to make the decision for you. Every truck owner's situation is different. If you're running a work truck in a rural area with no emissions testing, towing heavy loads daily, and willing to accept the legal risk — a delete might make practical sense for your operation. If you're in California or another heavily regulated state, driving primarily on public roads, or want to maintain warranty coverage and legal compliance — keep your emissions systems.

What matters most is going in with full knowledge of what you're gaining and what you're giving up. Don't let anyone tell you it's a no-brainer either direction — it's a calculated risk that only you can evaluate for your specific situation.