6.7 Cummins Delete Kit: Complete Guide for All Years

Let's break it down. A full delete on the 6.7 Cummins isn't a single part — it's a coordinated hardware-and-software package. Miss one piece and your truck throws codes before you pull out of the driveway.

The Three Hardware Components

• DPF/CAT Delete Pipe — Replaces the diesel particulate filter and oxidation catalyst section with a straight pipe, typically 4" diameter. Primary goal: eliminate backpressure, stop forced regen cycles, and reduce exhaust gas temperatures (EGT) under heavy load. The Diesel Dudes carries year-specific pipes for the 6.7 Cummins from 2007.5 through 2024 ^{[41][42][43][44]}.
• EGR Delete Kit — Removes or blocks off the EGR valve, EGR cooler, and associated coolant plumbing. The EGR system recirculates hot exhaust gases back into the intake to reduce NOx — but over time it coats the intake manifold with soot and is a leading cause of EGR cooler failures on the 6.7 Cummins. Year-specific kits are available for 2007–2009 ^[13] and 2010–2024 ^[14] platforms.
• SCR/DEF System (2013+ trucks only) — Starting with the 2013 model year, Ram added a selective catalytic reduction (SCR) system requiring diesel exhaust fluid (DEF). Full delete kits for 2013+ trucks must remove or bypass the DEF tank, DEF injector, SCR catalyst canister, and NOx sensors. This adds significant complexity versus pre-SCR trucks.

The Delete Tune — Non-Negotiable

The ECM tune is what ties everything together. Without it, the truck's computer detects missing emissions hardware, throws P-codes for DPF differential pressure, EGR flow, NOx sensor output, and DEF level, then triggers a derate or full limp mode. The tune rewrites those monitoring strategies, adjusts fueling, and optimizes boost for the new unrestricted exhaust flow. The EFI Live Autocal V3 ^[54] and EZ LYNK Auto Agent platforms ^[15] are popular options covering 2007.5–2021 6.7 Cummins trucks. According to The Diesel Dudes Technical Team ^[4], a properly calibrated tune is what delivers the 60–120 HP and 150–200 lb-ft gains owners report — the hardware just removes the restrictions the tune exploits.

Disclosure: The Diesel Dudes sells some of the products mentioned in this article. Our recommendations are based on hands-on testing and customer feedback.

This is where most buyers go wrong. They grab a kit for a buddy's 2015 and try to bolt it on a 2020. Here's the deal — it won't fit, the tune won't calibrate correctly, and you'll have sensors hanging in mid-air. Here's the full year-by-year breakdown ^[4]:

Key mechanical differences that force year-specific kit design: DPF flange style and location shift between the 3rd and 4th gen trucks. The SCR canister added in 2013 requires additional exhaust pipe sections. The 2019+ trucks got a revised variable-geometry turbo with a different outlet diameter, so front-pipe fitment changed again. ECM calibration is even more year-specific — a tune written for a 2012 ECM is not compatible with a 2018, let alone a 2022.

This is probably the most misunderstood topic in the diesel world right now. Let's set the record straight.

What the Law Actually Says

According to the EPA's Clean Air Act enforcement framework ^[2], 42 U.S.C. § 7522 — Section 203(a) — prohibits two things: removing or rendering inoperative any emission control device on a motor vehicle in use, and manufacturing, selling, or installing any defeat device. This applies to all Ram 2500/3500/4500/5500 trucks with the 6.7L Cummins, regardless of model year from 2007.5 forward. No exceptions exist for age or mileage of the vehicle.

The 2026 DOJ Memo: What It Actually Changed

As reported by Land Line Media ^[3], the DOJ announced it would stop pursuing criminal charges under the Clean Air Act for defeat device violations. That's a meaningful shift — but it is an adjustment in enforcement strategy, not a change in the law. The Clean Air Act itself was not amended. EPA civil enforcement continues. Fines for individuals can reach approximately $5,580 per violation under recent EPA guidance, and shops or manufacturers facing commercial-scale enforcement can see penalties reaching $45,000 per violation.

State Enforcement & CARB

Federal law aside, California Air Resources Board (CARB) maintains the most aggressive state-level enforcement. CARB penalties can exceed $10,000 per violation in some cases. Even in states without emissions testing programs, federal law still applies — the absence of an inspection station doesn't create a legal exemption.

Off-Road vs. On-Road

Delete kits are sold domestically as competition/off-road use only parts. The legal exposure occurs when a registered vehicle operates on public roads with emissions equipment removed. A dedicated, unregistered competition truck or farm rig sits in different territory — but enforcement is based on actual use, not the owner's stated intentions. As Jay Malone CDJR notes ^[1], many of the frustrations that drive owners toward deletes — DPF regens, EGR fouling, DEF faults — have legitimate OEM repair solutions that don't carry legal risk.

Legal Notice: Removing or tampering with emissions equipment may violate the federal Clean Air Act and state emissions regulations. Penalties can include fines up to $5,000 for individuals. Check your local and state laws before modifying emissions equipment on any vehicle driven on public roads.

The 6.7 Cummins that rolled off the line in 2007.5 shares its basic displacement with the 2024 version, but from an emissions hardware standpoint, these are very different animals. Here's what changes by generation and why it matters for kit selection.

2007.5–2012: Pre-SCR Platform

These trucks are the simplest to delete. The emissions package includes the DPF, a DOC (diesel oxidation catalyst), and the EGR valve and cooler — but no SCR catalyst, no DEF tank, and no NOx aftertreatment. The delete hardware for this era consists of an EGR block-off plate and coolant re-route ^[13], plus a DPF/CAT delete pipe ^[8] or full 5" turbo-back exhaust ^[23]. The ECM tune disables DPF regen logic and EGR strategies. Installation time runs approximately 4–6 hours.

2013–2018: SCR/DEF Enters the Picture

The fourth-gen Ram added selective catalytic reduction in 2013. This means the delete kit for this era must also address the SCR canister (physically located downstream of the DPF), the DEF injector, the DEF tank, and the NOx sensors before and after the SCR. The exhaust pipe section is longer and differently flanged to accommodate the additional canister length. The EZ LYNK platform ^[15] handles the more complex ECM calibration on these trucks effectively. TDD's 2013–2018 Full Delete Bundle ^[17] starts at $1,832 and covers all of this hardware.

2019–2021: Revised Turbo, Different Front Pipe

Cummins revised the variable-geometry turbocharger (VGT) on the 2019 platform. The turbo outlet diameter and orientation changed, which means the front section of any DPF delete pipe must be redesigned to mate correctly ^[43]. Slapping a 2015 front pipe on a 2020 will not seal properly. The ECM on 2019+ trucks also has more robust OBD-II monitoring of DEF quality and NOx sensor output, requiring more sophisticated tune calibration. The 2019–2021 Full Delete Bundle ^[18] starts at $2,394.

2022–2024: Updated ECM, Higher Kit Cost

The latest fifth-gen trucks see continued tightening of emissions monitoring strategies in the ECM software. The 2022–2024 delete tuning kit ^[5] and associated hardware ^[6][44] reflect this added complexity — TDD's Full Delete Bundle for 2022–2024 starts at $6,734, reflecting the engineering required to properly support these trucks in off-road/competition applications. The exhaust systems for these trucks have revised flange sizing as well ^[31].

Let's talk real numbers. Pricing varies significantly by generation, driven by the complexity of the emissions hardware and the ECM calibration required.

Here's the deal on what drives the price difference: it's almost entirely the tuner and calibration cost. Pre-SCR trucks (2007.5–2012) have simpler ECM strategies to address — fewer sensors, no DEF system, and a more straightforward fault suppression map. The 2022–2024 trucks have layered OBD-II monitoring with NOx sensors upstream and downstream of the SCR, DEF quality sensors, DPF differential pressure sensors, and tighter derate thresholds. Getting the ECM calibration right on a 2023 Ram is genuinely more engineering work than on a 2011.

Cab & Chassis trucks add another pricing variable. Standard bolt-on delete pipes don't fit C&C configurations due to different frame rails and body mounting — TDD carries purpose-built C&C bundles for the 6.7 Cummins from 2010–2021 ^[7] that address this. If you've got a service body or flatbed setup, make sure you're ordering the correct pipe configuration.

Individual components are also available if you already have a tuner. A standalone DPF/CAT delete pipe for a 2013–2018 Ram runs from $399 ^[9], and the EGR delete kit for 2010–2024 starts at $299 ^[14]. Bundles deliver better value when you're starting from zero.

Here's the technical picture of what actually changes when you remove the DPF, EGR, and SCR systems and run a properly calibrated delete tune on a 6.7 Cummins.

Exhaust Backpressure & EGT

The factory DPF assembly on a 6.7 Cummins creates measurable exhaust backpressure, particularly as soot loading increases between regen events. Elevated backpressure reduces the pressure differential across the turbocharger, which slows spool and increases exhaust gas temperatures. Removing the DPF and replacing it with a free-flowing 4" or 5" delete pipe directly reduces backpressure and lowers EGT under load — which matters significantly when towing at or near max capacity for extended periods.

Power & Torque Gains

According to The Diesel Dudes Technical Team ^[4], a properly tuned 6.7 Cummins delete typically adds 60–120 HP and 150–200 lb-ft of torque depending on tune aggressiveness and truck condition. The biggest gains appear at mid-range RPM — the 1,400–2,200 RPM band where the 6.7 Cummins makes its peak torque — where DPF and EGR restrictions were most impactful on exhaust flow. The tune adjusts fueling maps, boost targets, and injection timing to take advantage of the unrestricted exhaust path.

EGR Removal: Intake Contamination Eliminated

The EGR system on the 6.7 Cummins recirculates hot, soot-laden exhaust gases back into the intake manifold. Over time, this deposits a thick layer of carbon soot on intake ports, the intake manifold floor, and the EGR cooler heat exchanger. EGR cooler failure is a known reliability concern on the 6.7 — coolant contamination of the intake is the worst-case outcome. Removing the EGR valve and cooler and plating the ports eliminates this failure mode entirely. As noted by Jay Malone CDJR ^[1], some of these complaints have legitimate OEM repair solutions, but the recurring nature of EGR fouling on high-mileage trucks is well-documented.

Regen Cycles Eliminated

A factory 6.7 Cummins in DPF-equipped configuration initiates active regen cycles every 300–500 miles depending on duty cycle. During regen, the ECM injects post-combustion fuel to raise exhaust temps and burn accumulated soot in the DPF — this process uses fuel, elevates EGT, and on severe-duty trucks can cause oil dilution if regens occur frequently. Deleting the DPF eliminates regen cycles entirely.

Environmental Trade-Off

The EPA's enforcement data ^[2] reflects why these regulations exist: removing the DPF and SCR significantly increases both particulate matter (soot) and NOx emissions — the pollutants these systems were engineered to control. This environmental impact is the core rationale behind Clean Air Act Section 203(a) restrictions on emissions system tampering.

Beyond the legal question, there are three real-world consequences that affect every deleted truck regardless of how carefully the install was done.

The Federal Emissions Warranty

Federal law requires an emissions warranty on new diesel trucks covering major emissions components — DPF, EGR, SCR, associated sensors, and software — for 8 years or 80,000 miles. The moment you remove any of that hardware, that warranty is gone. On a truck you paid $75,000+ for, that's a meaningful exposure. And because powertrain warranties contain tampering exclusion language, a dealer who discovers a delete during a powertrain repair can deny coverage for failures they can reasonably connect to the modification.

The Dealer Position

Authorized Ram dealers will not perform deletes. Jay Malone CDJR ^[1] states explicitly that they refuse delete requests on the 6.7L Cummins, citing Clean Air Act Section 203(a)(3), warranty voidance, reduced resale value, and the fact that most complaint-driven delete requests have legitimate engineering fixes available. Their diesel technicians can address DPF clogging, EGR fouling, and DEF system faults through proper OEM repair procedures without resorting to tampering. That's actually the right call for a road-registered truck.

Resale Reality

Selling a deleted truck through a dealer is effectively impossible — they won't take it as a trade or put it on the lot due to the known Clean Air Act violation. Private party sales narrow your buyer pool to enthusiasts in states without emissions testing programs, and even then, buyers pay a discount to account for the legal risk they're absorbing. If you're in California or any CARB-aligned state, a deleted truck can fail registration renewal — the OBD-II inspection will flag missing emissions hardware and active fault codes immediately.

When Delete Makes Sense (Off-Road/Competition)

For a dedicated off-road competition truck, an unregistered farm rig, or a purpose-built pulling truck that never sees public roads, the reliability and performance calculus changes. Eliminating DPF, EGR, and SCR failure modes from a truck that works for a living in conditions that accelerate those failures is a legitimate engineering decision. The key is that the truck must not be operated on public roads — that's where the legal line is drawn. If that describes your situation, TDD's year-specific full delete bundles ^[17][18][19] are engineered specifically for that application.

Here's a direct look at TDD's lineup by generation so you can find your truck's kit without guessing.

2007.5–2012 Kits (Pre-SCR)

For the early 6.7 Cummins, the core components are an EGR delete (2007–2009 ^[13] or 2010–2024 ^[14] depending on your year), a DPF/CAT delete pipe or 5" full exhaust ^[23], and a tuner. The H&S Mini Maxx V1 ^[16] covers 2006–2012 trucks and is a proven option for this generation. The EFI Live Autocal V3 ^[54] is the alternative for owners who want more tuning flexibility across the 2007–2021 range. Full Delete Bundles for 2010–2012 start at $1,784.

2013–2018 Kits (SCR/DEF Era Begins)

This is TDD's highest-volume generation with 484 verified reviews on the Full Delete Bundle ^[17] alone. The kit includes EGR delete hardware ^[14], a DPF/CAT delete pipe ^[9] or 5" full exhaust ^[29], and DEF system bypass. The EZ LYNK Auto Agent with Lifetime Support Pack ^[15] is the tuner of choice for this generation — the cloud-based support model allows tune updates as calibration is refined. The 2013–2018 bundle starts at $1,832.

2019–2021 Kits (Revised Turbo Platform)

The 2019+ DPF/CAT delete pipe ^[43] has a different front section to accommodate the revised VGT turbo outlet. Make sure you're ordering the 2019–2021 specific components, not the 2013–2018 parts — the flange geometry doesn't transfer. The 2019–2021 Full Delete Bundle ^[18] starts at $2,394 and includes all platform-specific hardware. A 5" full exhaust option ^[30] is also available for maximum flow.

2022–2024 & 2025–2026 Kits (Latest Platform)

The newest generation requires the 2022–2024 Cummins Delete Tuning Kit ^[5] and year-specific exhaust components ^[6][44][31]. The 5" full exhaust for 2022–2024 ^[31] and the DPF/CAT pipe ^[44] are engineered for the revised exhaust layout and updated sensor bung locations on these trucks. The Full Delete Bundle for 2022–2024 ^[19] starts at $6,734, reflecting the significantly more complex ECM calibration. TDD also carries bundles for 2025 and 2026 trucks as those platforms are supported. Call (888) 830-2588 to confirm the latest availability for the newest model years.

For Cab & Chassis applications on 2010–2021 trucks, the C&C-specific bundle ^[7] addresses the non-standard frame rail and body configurations that prevent standard pickup truck pipes from fitting correctly.