Cummins 6.7 DPF Delete Kit: What's Included, Year Fitment & What to Look For

The term "DPF delete kit" gets thrown around loosely online, but a real kit is more than a straight pipe bolted where your filter used to sit. The DPF (Diesel Particulate Filter) is a wall-flow ceramic filter that traps soot from the exhaust stream and periodically burns it off through a process called regeneration. Alongside it sits the EGR (Exhaust Gas Recirculation) system, which routes hot exhaust back into the intake to lower combustion temperatures and reduce NOx output. On 2013+ Ram HD trucks, a SCR (Selective Catalytic Reduction) catalyst and DEF (Diesel Exhaust Fluid) system were added to further reduce NOx emissions downstream.

A complete delete kit addresses all three systems at once. Leaving any one active while removing another creates sensor conflicts that will put your truck into limp mode or generate a wall of DTCs. The Diesel Dudes Technical Team has seen hundreds of trucks come in with half-done deletes — exhaust pipe swapped, EGR still live, no tune. Every single one was either throwing codes or running poorly.

According to The Diesel Dudes product lineup ^[106], a full delete bundle for a 2013–2018 Ram 6.7 Cummins starts at $1,832 and includes all hardware plus matched ECM calibration. The bundle approach eliminates the guesswork of sourcing components individually and ensures the tune is calibrated to the specific hardware in the kit. For off-road and competition use, this is the correct way to execute a full delete.

The 6.7L Cummins has been in continuous production since 2007.5, and Cummins has documented the engine's emissions control evolution across multiple generations. Each generation carries different hardware configurations, which is why year-specific fitment matters so much.

Here's the deal — there's no gray area on this one. The federal Clean Air Act at 42 U.S.C. § 7522(a)(3)(A) explicitly prohibits removing or rendering inoperative any device or element of design installed to comply with EPA emission standards on any motor vehicle operated on public roads ^[2]. This prohibition applies to both installers and vehicle owners.

At the regulatory level, 40 CFR § 1068.101(b)(1) reinforces this by banning anyone from removing or defeating emission controls that were installed to meet EPA certification standards. The EPA has actively enforced these provisions — a 2024 consent decree against an aftermarket parts distributor resulted in significant financial penalties and product removal orders, demonstrating that federal enforcement is real and ongoing ^[2].

At the state level, the picture varies but is generally restrictive. California's CARB maintains some of the strictest aftermarket parts regulations in the country. Many states run OBD-II-based emissions inspections and will flag a deleted truck immediately — missing DPF/EGR hardware and disabled readiness monitors are instant failures.

Land Line Media reported in 2025 that while DOJ enforcement priorities have shifted, the underlying federal law has not changed — a DOJ reprieve is not a green light ^[1]. The Clean Air Act statute remains in force regardless of current enforcement posture.

The Diesel Dudes sells all delete kits for off-road and competition use only. This includes dedicated farm trucks, closed-course competition vehicles, and off-highway work machines. If your truck ever sees public roads, restoring the OEM emissions hardware is required to remain street-legal.

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 is a tough engine. The emissions hardware bolted to it, however, was designed around on-highway duty cycles — not the short-trip, high-idle, or high-load patterns common in off-road, agricultural, or competition use.

DPF Regeneration Problems — Active regen burns accumulated soot by injecting fuel late in the combustion cycle to raise exhaust temperatures. In trucks used for short trips, low-speed towing, or frequent idling, the DPF never gets hot enough to complete passive regen, triggering active regen cycles constantly. This consumes additional fuel and can cause oil dilution in the crankcase as unburned fuel washes past the rings during late injection events.

EGR Cooler and Valve Failures — The EGR cooler on the 6.7 Cummins routes hot exhaust gas through a coolant-fed heat exchanger before recirculating it into the intake. Under sustained high-load operation, the cooler can crack or fail, leading to coolant loss, white smoke, and potential coolant contamination of the intake system. EGR valve sticking from soot buildup is also a documented issue, causing rough idle, poor throttle response, and DTCs.

DEF System Faults — The SCR/DEF system introduced on 2013+ trucks adds additional failure points: DEF quality sensors, NOx sensors, SCR catalyst degradation, and DEF heater failures in cold climates. A DEF fault will trigger a derate cycle that progressively limits engine output if not corrected.

Limp Mode from DPF Overload — When the DPF reaches its soot load limit and active regen cannot complete — due to drive cycle, ambient temperature, or load conditions — the ECM triggers a derate. At extreme load levels, the truck can enter severe limp mode, limiting power output significantly until the filter is manually regenerated or replaced.

These are the real-world conditions that drive off-road operators toward researching a 6.7 Cummins delete kit. For trucks that will never operate on public roads, eliminating these systems removes the failure modes entirely.

This is where a lot of truck owners get burned by generic or incorrectly matched kits. The 6.7L Cummins has been continuously updated across its production run, and the emissions hardware on a 2008 Ram 2500 is fundamentally different from what's on a 2022 Ram 3500.

Year Range	Make/Model	Engine	Compatible Delete Bundle
2007.5–2009	Ram 2500/3500	6.7L Cummins	Full Delete Bundle 2007–2009
2010–2012	Ram 2500/3500	6.7L Cummins	Full Delete Bundle 2010–2012
2013–2018	Ram 2500/3500	6.7L Cummins	Full Delete Bundle 2013–2018
2019–2021	Ram 2500/3500	6.7L Cummins	Full Delete Bundle 2019–2021
2022–2024	Ram 2500/3500	6.7L Cummins	Full Delete Bundle 2022–2024

2007.5–2009: First generation 6.7 Cummins with DPF and EGR, no SCR/DEF system. The DPF and DOC (Diesel Oxidation Catalyst) are the primary aftertreatment components. The Diesel Dudes 2007–2009 Full Delete Bundle ^[104] is spec'd for this simpler hardware configuration.

2010–2012: Updated DPF/EGR management with revised ECM calibrations. Still no DEF on Ram HD pickups during this period. The 2010–2012 bundle ^[105] accounts for the revised sensor and hanger positions.

2013–2018: SCR/DEF system added to meet tighter NOx standards. This generation runs DPF + DOC + SCR + EGR simultaneously — the most complex of the three generations to delete properly. Sensor count is higher, and the exhaust routing is longer. The 2013–2018 bundle ^[106] is the most popular, with 484 verified reviews on the TDD product page.

2019–2021 and 2022–2024: Further tightened OBD diagnostics, revised frame geometry affecting exhaust pipe length, and in the 2022+ trucks, significantly more complex ECM architecture requiring specialized tuning solutions ^[107][108]. Cab & Chassis variants across all years also require a different pipe configuration than standard pickup beds ^[30].

What's Included in a Full 6.7 Cummins Delete Bundle

• DPF/CAT Delete Pipe or Full Exhaust System — Replaces the factory DPF, DOC, and SCR section with a mandrel-bent straight-through pipe. Available in 4" or 5" diameter. The 4" pipe is a direct bolt-in replacement for the filter section; a 5" full turbo-back exhaust replaces the entire exhaust from the turbo outlet rearward. A 4" delete pipe for the 2007.5–2012 6.7 Cummins ^[36] weighs approximately one-fifth of the OEM DPF assembly — a significant reduction in vehicle weight at the back of the cab.
• EGR Delete Kit — Includes billet aluminum or steel block-off plates to seal the EGR valve and cooler ports, a coolant reroute fitting to maintain proper coolant flow after the EGR cooler is removed, replacement gaskets, and all required hardware. The EGR Delete for 2010–2024 6.7 Cummins ^[55] starts at $299 as a standalone kit.
• DEF/SCR Delete Components — On 2013+ trucks, this includes sensor simulators or wiring resistors to prevent DEF-related DTCs after the SCR catalyst and DEF tank are removed. Often handled primarily through tuning rather than additional physical hardware.
• ECM Delete Tune — The tune is the most critical component. Without it, removing hardware leaves the ECM in a fault state. A proper delete tune disables DPF, SCR, and EGR diagnostics; adjusts fueling maps for freer-flowing exhaust; and optimizes boost targets. Options for the 6.7 Cummins include the EFI Live AutoCal V3 ^[49] and the EZ LYNK Auto Agent 3 ^[65].
• Supporting Hardware — Clamps, exhaust hangers, O-rings, coolant hose, and mounting hardware. Quality kits include all fasteners — you should not need to source additional hardware at the parts store.

The Diesel Dudes bundles are engineered so every physical component and the tune are calibrated to work together. Owners consistently report 60–120 HP and 150–200 lb-ft of torque gains on a properly deleted and tuned 6.7 Cummins, with the biggest improvements at mid-range RPM where DPF backpressure was most restrictive ^[106].

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

Let's break it down objectively. The technical case for deleting an off-road-only 6.7 Cummins is solid. The tradeoffs are equally real and need to be understood before you cut anything.

Technical Benefits (Off-Road Context)

Reduced Exhaust Backpressure — A loaded DPF creates measurable restriction in the exhaust stream. Removing it allows the turbocharger to work against lower exhaust back pressure, improving turbine efficiency and reducing pumping work on every power stroke. The result is lower exhaust gas temperatures (EGTs) under hard load — a meaningful safety margin for competition and heavy towing applications.

No Regen Cycles — Active regeneration consumes additional fuel and, in some conditions, causes oil dilution as late-injected fuel washes past the cylinder walls. Eliminating regen removes this fuel penalty entirely and eliminates the associated oil contamination risk.

Cleaner Intake Tract — With EGR disabled, hot soot-laden exhaust no longer passes through the intake manifold. The intercooler, intake manifold, and compressor wheel of the turbo stay significantly cleaner over time — extending maintenance intervals and preserving airflow efficiency.

DEF System Eliminated — No DEF to freeze in cold climates, no DEF quality sensors to fail, no SCR catalyst to crack from thermal cycling or rough terrain vibration.

Tradeoffs to Understand

Legal Risk — As covered in the legal section above, operating a deleted truck on public roads violates 42 U.S.C. § 7522. Land Line Media confirmed in 2025 that a DOJ enforcement reprieve does not change the underlying statute ^[1]. State inspection failures and registration denial are additional practical consequences.

Increased Emissions — Without DPF, EGR, and SCR functioning, particulate matter and NOx output increase substantially. The EPA's diesel emission control technology documentation confirms that DPF systems reduce particulate matter by over 90% compared to unfiltered exhaust.

Warranty Impacts — OEM warranty coverage on emissions-related components is voided by modifications that tamper with emissions hardware. On a newer truck still under the 5-year/100,000-mile powertrain warranty, this is a real financial consideration.

Generic kits from discount sources share a consistent pattern: exhaust pipe only, no EGR hardware, no tuning, no support. The customer saves $200 on the pipe, then spends $600+ trying to source a matching tune and dealing with fitment issues. Here's what to evaluate before you order.

1. Exact Model Year and Chassis Type

This is non-negotiable. A 2013 Ram 3500 and a 2019 Ram 3500 use completely different exhaust routing, sensor configurations, and ECM architectures. Order the wrong year and you're looking at modified hangers, sensor port mismatches, and a tune that won't communicate properly with your ECM. Cab & Chassis variants — Ram 4500 and 5500 — also require different pipe lengths and hanger positions versus standard pickup configurations. The Diesel Dudes carries a dedicated Cab & Chassis bundle ^[30] specifically for this reason.

2. Tuning Solution

The tune makes or breaks the delete. For 2007–2021 6.7 Cummins trucks, the EFI Live AutoCal V3 ^[49] is a proven option with 85 verified reviews on the TDD product page. The EZ LYNK Auto Agent 3 ^[65] supports 2007.5–2021 and includes lifetime support. For 2022–2024 trucks, the ECM architecture requires the specialized 2022–2024 Cummins Delete Tuning Kit ^[7] — a standard tune from an older platform will not work.

3. Exhaust Pipe Diameter

4" is the standard bolt-in replacement diameter that mates directly to your factory exhaust flanges. A 5" full exhaust system delivers higher flow volume and is the better choice for trucks being pushed harder — towing maximum loads, competition pulling, or high-horsepower builds. The 5" Full Exhaust for 2013–2018 ^[24] starts at $799.

4. Complete Bundle vs. Piece-by-Piece

A complete bundle guarantees component compatibility. The TDD 2013–2018 Full Delete Bundle ^[106] starting at $1,832 includes everything in a single shipment — no second-guessing whether your exhaust pipe and EGR kit are designed to work together. The Dodge Cummins collection ^[126] covers all year ranges with year-matched bundles.

This is a high-level workflow — not a torque-spec-by-torque-spec guide. Use the detailed install documentation that ships with your kit and the Diesel Dudes install video resources for step-by-step guidance.

Preparation

Get the truck on a lift or solid jack stands with good clearance under the cab. Spray penetrating oil on all exhaust clamps and hangers the night before — factory hardware on high-mileage trucks can be severely corroded. Disconnect both batteries before starting any work on sensor wiring.

Exhaust Removal and DPF Delete Pipe Installation

Unplug all sensors connected to the DPF, DOC, and SCR assembly — pressure sensors, temperature sensors, and NOx sensors all need to be disconnected before the assembly drops. Unbolt the downpipe clamp, release all exhaust hangers, and lower the OEM assembly. The factory DPF/DOC/SCR unit is heavy — have a helper or floor jack ready. Slide the delete pipe into position, hang it using the factory rubber grommets, and torque the clamp hardware. The 4" TDD delete pipes use 3/8" flange bolts with lock washers at the connection points.

EGR System Removal

Drain approximately 1–2 gallons of coolant before disconnecting EGR cooler fittings to minimize spillage. Remove the EGR valve, cooler, and associated piping. Install the billet block-off plates over the EGR ports on the intake and head. Connect the coolant reroute hose included in the EGR delete kit to maintain proper coolant circulation through the block.

Tuning

Connect your tuner to the OBD-II port under the dash. Flash the appropriate off-road calibration for your year and hardware configuration. After flashing, clear all stored DTCs and verify with a scan tool that no active codes remain. Confirm EGT readings at idle and light load are within normal range before pushing the truck hard.

Professional installation is recommended for 2022–2024 trucks due to the more complex ECM architecture. Install time for these trucks typically runs on the longer end of the 4–8 hour range. For any year, if you're not comfortable with coolant system work or exhaust sensor wiring, a shop with a lift will get the job done in an afternoon.