Diesel Delete Kit Cummins: the Complete Buyer's Guide (2007.5–2024)

Here's the deal — a Cummins delete kit is not just a pipe swap. The 6.7L Cummins in 2007.5+ Ram 2500 and 3500 trucks runs a full emissions stack: an EGR (Exhaust Gas Recirculation) system that routes hot exhaust soot back into the intake, a DPF (Diesel Particulate Filter) that traps soot and burns it off in active regen cycles, a DOC (Diesel Oxidation Catalyst), and a SCR (Selective Catalytic Reduction) system fed by DEF (Diesel Exhaust Fluid) injection. Every single one of those systems has its own sensors, wiring harnesses, and ECM monitoring logic.

A true delete kit addresses all of them at once. The hardware side replaces the physical components — DPF delete pipe or full 4-inch/5-inch exhaust, EGR block-off plates and coolant plugs, and DEF bypass resistors or harnesses. The tune side is where the ECM gets reprogrammed to stop monitoring for those components, disable regen cycles, and optimize fueling and boost for the new exhaust flow path.

A delete kit without a tuner simply doesn't work. Pull the DPF without a supporting tune and the ECM will immediately set multiple fault codes, trigger limp mode, and start a derate cycle. The EGR delete plates alone will generate a P0401 (EGR insufficient flow) code that won't clear without a tune. Every credible Cummins delete starts with the tune — hardware follows.

The Diesel Dudes carries full delete bundles for every 6.7 Cummins year range from 2007.5 through 2024 ^{[109][110][111]}, each spec-matched to the specific emissions hardware and ECM strategy used in that generation. This is the baseline — let's break down what each component does.

Let's be direct about the legal landscape before going any further. The U.S. Clean Air Act, codified at 42 U.S.C. § 7522(a)(3), prohibits two things: (A) removing or rendering inoperative any emission control device on a motor vehicle, and (B) manufacturing, selling, or installing any part whose principal effect is to bypass or defeat any element of the vehicle's emission control system. These prohibitions apply to street-driven vehicles.

The EPA maintains a dedicated National Enforcement and Compliance Initiative specifically targeting aftermarket defeat devices for vehicles and engines ^[5]. This is an active enforcement program — not a theoretical risk. As Heavy Duty Trucking reported in 2025, the Justice Department announced it would pull back on criminal prosecution of individual diesel delete cases ^[1], but as Land Line Media noted in the same news cycle, that DOJ reprieve is not a green light — civil EPA enforcement and Clean Air Act penalties remain on the books ^[3].

State-level enforcement adds another layer. Many states run OBD-II readiness checks and visual inspections during annual registration. A truck with no DPF or EGR hardware will fail both. Penalties can include fines, failed inspections, and inability to register the vehicle.

The EPA has also recently updated its DEF sensor guidance ^[2], but this applies to compliance certification — not to the legality of removing DEF systems from street-driven trucks.

The bottom line: Delete kits sold by The Diesel Dudes are marketed and intended exclusively for off-road, competition, or non-emissions-controlled vehicle use. If you're building a dedicated off-road truck, a race rig, or a non-registered work machine, this is your path. If you're planning to drive it on public roads, check your local and state regulations first.

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.

DPF Delete Pipe or Full Exhaust

The DPF delete pipe replaces the factory DPF canister, DOC, and SCR section. On the 6.7 Cummins, this is typically a 4-inch or 5-inch stainless steel race pipe that bolts in place of the entire emissions stack downstream of the turbo. A 5-inch system flows significantly more than the factory setup, dropping exhaust backpressure by 15–25 PSI under load and eliminating the need for active regen cycles. The Diesel Dudes offers both 4-inch ^[15] and 5-inch ^[27] full exhaust options for 2013–2018 Cummins trucks, and year-specific pipes for every other generation.

EGR Delete Kit

The EGR delete kit removes the exhaust gas recirculation cooler and valve, replacing them with CNC-machined block-off plates, coolant plugs, and reroute fittings. This stops the recirculation of hot, soot-laden exhaust gas back into the intake manifold — the primary cause of intake fouling, elevated intake temps, and the infamous EGR cooler failures that can run $3,000–$5,000 in repair costs. The Diesel Dudes EGR delete for 2010–2024 Cummins trucks ^[58] covers the fourth and fifth gen platforms with precision-fit hardware.

DEF/SCR Bypass

The DEF system bypass disables DEF injection, the NOx sensors, SCR pressure sensors, and the DEF level and temp sensors — all via the supporting tune and/or bypass harnesses depending on model year. No more DEF fluid costs. No more crystallization failures in lines or injectors. No more pump or heater codes causing derates.

ECU Tuner (Mandatory)

The tuner is the brain of the whole operation. For 6.7 Cummins, The Diesel Dudes pairs bundles with either the EZ Lynk AutoAgent 3 ^[68] (cloud-based, supports 2007.5–2021 with unlimited file updates) or the RaceMe Ultra ^[105] (plug-and-play with a 7-inch touchscreen and real-time gauge monitoring). Both load custom delete tunes via the OBD-II port and handle all emissions-related DTC suppression.

Additional Components in Premium Bundles

• Throttle Valve Delete ^[119] — Removes the intake throttle valve that can stick and cause idle issues
• CCV Delete Kit ^[34] — Reroutes crankcase ventilation so oily vapors stop recirculating into the intake
• Grid Heater Delete ^[97] — Optional for cold-weather builds; requires proper tune support
• All hardware, clamps, gaskets, and bypass plugs — No chasing parts mid-install

The performance numbers on a deleted 6.7 Cummins are real — but understanding why they happen makes it easier to evaluate whether a delete makes sense for your build.

Power and Torque: The tune does the heavy lifting here. A properly calibrated delete tune for the 6.7 Cummins unlocks fueling and timing tables that the factory ECM restricts to protect the DPF from over-fueling. Combined with the backpressure reduction from removing the DPF stack, owners consistently report 60–120 HP gains and proportional torque increases. The biggest gains show up in the mid-range RPM band — exactly where towing and hauling demand the most.

Fuel Economy: Active regen cycles on a stock 6.7 Cummins inject raw fuel into the exhaust stream to raise DPF temps and burn off accumulated soot. These cycles occur every 300–700 miles and burn measurable fuel each time. Eliminating them, combined with reduced exhaust backpressure, typically nets 2–4 MPG improvement — more under steady highway loads and heavy towing.

EGT Reduction: With the DPF restriction removed and fueling optimized, exhaust gas temperatures (EGT) drop 200–300°F under tow load compared to stock. Lower EGTs mean less thermal stress on the turbo, pistons, and exhaust valves — directly translating to longer component life in a hard-working off-road truck.

Reliability and Maintenance Savings: Here's where the math gets interesting for high-mileage off-road trucks. DPF cleaning runs $800–$1,200 every ~100,000 miles. EGR cooler failure repair hits $3,000–$5,000. DEF system failures — crystallized injectors, failed pumps, NOx sensor replacements — add thousands more. The Diesel Dudes Technical Team estimates that a full delete can avoid $8,000–$12,000 in emissions-related repairs over 200,000 miles for an off-road 6.7 Cummins ^[109]. That math alone drives a lot of builds.

Engine Longevity: The EGR system recirculates soot directly into the intake manifold, combustion chambers, and engine oil. With the EGR delete in place, the engine ingests clean, cool intake air. Oil stays cleaner longer. Intake valves stay free of carbon buildup. The engine runs cooler and cleaner — which matters for any truck expected to rack up serious off-road mileage.

Let's break down what a 6.7 Cummins delete actually costs, and compare that against the cost of staying stock on an off-road build.

Bundle	Year Range	Starting Price
Ram Cummins 6.7 Full Delete Bundle	2010–2012	From $1,784
Ram Cummins 6.7 Full Delete Bundle	2013–2018	From $1,832
Ram Cummins 6.7 Full Delete Bundle	2019–2021	From $2,394
Ram Cummins 6.7 Full Delete Bundle	2022–2024	From $6,734

The jump in cost for 2022–2024 trucks reflects the significantly more complex emissions architecture and security modules in the fifth-gen platform. The 2013–2018 bundle ^[109] is the most popular — 484 reviews and the broadest install base in the Cummins community.

Component-level pricing for context:

• DPF delete pipe (4-inch or 5-inch): ~$300–$500 standalone
• EGR delete kit: ~$250–$400 depending on year
• Tuner: EZ Lynk AutoAgent 3 at $1,724 ^[68]; RaceMe Ultra from $1,534 ^[105]; EFI Live AutoCal V3 from $934 ^[52]

The cost-of-staying-stock comparison: One EGR cooler failure = $3,000–$5,000. One DPF cleaning = $800–$1,200. One DEF pump replacement = $500–$1,500. Stack two of those events over 200,000 miles of off-road use and you've already exceeded the cost of the delete kit — without any of the performance benefits. The bundle pays for itself before you hit 150,000 miles on a hard-use off-road build.

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

Fitment is the most common mistake in a Cummins delete build. The emissions architecture changed significantly across generations — EGR cooler design, DPF mounting, DEF dosing strategy, and ECM security all differ by year. Here's the full compatibility breakdown for the 6.7 Cummins platform:

Year Range	Engine	Platform Notes	Compatible TDD Bundle
2007.5–2009	6.7L Cummins	3rd gen, EGR + DPF only (no DEF/SCR)	2007–2009 Bundle
2010–2012	6.7L Cummins	3rd gen late; DEF/SCR added 2010+	2010–2012 Bundle [108]
2013–2018	6.7L Cummins	4th gen; revised EGR cooler, full DEF stack	2013–2018 Bundle [109]
2019–2021	6.7L Cummins	5th gen; new exhaust routing, updated ECM	2019–2021 Bundle [110]
2022–2024	6.7L Cummins	5th gen late; enhanced security modules, complex SCR	2022–2024 Bundle [111]

Cab-and-chassis (C&C) trucks require special attention. The longer frame and lack of a factory bed changes the exhaust routing — standard bolt-on pipes may not fit. The Diesel Dudes offers a dedicated Cab & Chassis Ram Cummins Full Delete Bundle for 2010–2021 trucks that accounts for the different exhaust path.

If you're unsure about your exact year or configuration, call us at (888) 830-2588. Getting the right kit on the first order saves you a week of downtime.

Most DIY Cummins owners with basic mechanical experience can handle a full delete in a day. Here's the real install sequence — not a step-by-step torque spec sheet, but the workflow that matters for getting it right the first time.

1. Tune first, always. Connect your tuner (EZ Lynk, RaceMe, EFI Live AutoCal ^[52]) to the OBD-II port and load the delete tunes before pulling any hardware. Some 2018+ trucks require unlocking the ECM security module before tunes can be flashed — The Diesel Dudes Technical Team covers this during order support. Clearing existing emissions DTCs before the flash helps the process go cleanly.
2. DPF/exhaust swap. Disconnect all sensor harnesses connected to the DPF, DOC, and SCR assembly. Unbolt the factory section. The factory DPF canister on a 6.7 Cummins is heavy and awkward — a second set of hands or a transmission jack makes this easier. Install the new 4-inch or 5-inch race pipe using the supplied clamps and hardware.
3. EGR delete. Drain coolant to the level needed to access the EGR cooler. Remove the EGR valve and cooler assembly. Install CNC-machined block-off plates on the exhaust manifold side and intake side, along with coolant plugs or reroute fittings. This step typically takes 2–3 hours on its own — the coolant system access is tight on the 6.7 platform.
4. DEF/SCR bypass. The tune handles most of the DEF system disable. Install any bypass resistors or plug adapters included in the kit for NOx sensors and DEF system sensors. Check your kit instructions for year-specific sensor bypass locations.
5. Post-install checks. Clear all DTCs with the tuner. Check for exhaust leaks (run the engine and feel around pipe joints with your hand), coolant leaks at the EGR block-off plates, and confirm no check engine light. Monitor EGTs and boost pressure on your first few drives — EZ Lynk and RaceMe both display live gauges for this.

Based on hundreds of TDD installations, the most common install mistake is skipping the tune-first step. Hardware-first installs result in immediate limp mode and complicate the flash process. Always tune, then wrench.

Being straight with you matters more than selling you a kit. Here's the risk picture for a 6.7 Cummins delete — and how to manage it.

Warranty: Ram/Stellantis can deny warranty coverage on emissions-related failures after a delete — and under the Magnuson-Moss Warranty Act, they can deny coverage on other powertrain failures if they can demonstrate the modification caused or contributed to the failure. If your truck is still under factory warranty, factor that into the decision. For higher-mileage off-road builds where factory warranty is already gone, this is a non-issue.

Inspection and Registration: As noted in the legal section, trucks with removed DPF and EGR hardware will fail OBD-II readiness checks and visual emissions inspections in states that run them. This affects the truck's ability to pass annual inspection and, in some states, its ability to be registered. Plan accordingly for your intended use case.

Tuning Quality — the real risk factor: A poorly calibrated delete tune is the single biggest risk in any Cummins delete build. Over-fueling without proper EGT limits can push exhaust temperatures into piston-damaging territory (above 1,300°F sustained). Aggressive timing tables without proper safeguards stress the 68RFE or Aisin transmission. This is why The Diesel Dudes exclusively uses proven tuning platforms — EZ Lynk AutoAgent 3 ^[68], RaceMe Ultra ^[105], and EFI Live AutoCal V3 ^[52] — with delete files developed and validated specifically for 6.7 Cummins across all model years.

Best practices for your build:

• Monitor EGTs on every haul — keep sustained EGTs under 1,200°F for long-term engine health.
• Run quality oil and shorten oil change intervals slightly after the EGR delete until the intake and crankcase clean up from residual soot.
• Check exhaust clamps and EGR block-off plate bolts at the first 500-mile interval after install.
• Use the live monitoring features on your tuner — both EZ Lynk and RaceMe display boost, EGT, coolant temp, and fuel trims in real time.