Best EGR DPF Delete Kit for 6.7 Cummins: Top Picks & Buyer's Guide 2026

Let's break down what actually happens when you pull that emissions hardware off your 6.7L Cummins. The DPF (Diesel Particulate Filter) creates significant exhaust backpressure — robbing your turbo of efficiency and forcing the ECU to dump raw fuel during regen cycles. The EGR (Exhaust Gas Recirculation) system recirculates hot, soot-laden exhaust back into the intake, contaminating your intake manifold and coolant system over time.

Remove both, add a proper tune, and the results are real:

• Power gains: 50–100 HP and 200+ lb-ft of torque on a properly tuned full delete
• Fuel economy: 2–4 MPG improvement by eliminating fuel-burning regen cycles
• Reliability: No more EGR coolant mixing, DPF clogs, or DEF crystallization
• Maintenance savings: DPF replacements run $1,000–$2,500 each — delete once, done

According to Ramforum members who've run full deletes on 2013–2018 Rams, the difference in throttle response is described as "night and day" compared to stock ^[1]. The 2010+ trucks with active regen systems see the biggest real-world gains.

Year-range matters more on the 6.7 Cummins than almost any other platform. Here's the breakdown by generation:

Model Years	Systems Present	Key Delete Components	Tuner Required?
2007.5–2009	EGR only	EGR block-off plates, coolant reroute	Yes
2010–2012	EGR + DPF + DEF	Full delete pipe, EGR kit, DEF simulator	Yes — critical
2013–2018	EGR + DPF + DEF + CCV	Full bundle + CCV reroute	Yes — mandatory
2019–2024	All above + updated ECM	Latest EZ Lynk, HD-spec pipes	Yes — latest firmware

The 2013–2018 generation is the most popular delete platform. The 2019–2024 trucks run an updated ECM that requires current tuning hardware and firmware — don't try to flash a 2024 with older software.

Here's what separates a real delete kit from a parts-bin gamble. Every component serves a specific function, and gaps in coverage cause problems down the road.

DPF Delete Pipe: Replaces the Diesel Particulate Filter section of the exhaust. A quality 4" or 5" stainless pipe with proper flanges is standard — thin-wall budget pipes crack under heat cycling.

EGR Block-Off Plates: Seal the EGR passages at the intake manifold and cooler. Paired with coolant bypass lines and fittings to reroute coolant flow properly — skip the reroute and you risk air pockets and overheating.

DEF/SCR Disable: On 2010+ trucks, the DEF (Diesel Exhaust Fluid) system needs to be disabled via simulator plug or tuner programming. Without this, the ECU will derate the engine after roughly 40 hours of runtime.

Tuner with Delete Maps: The ECU must be reflashed to accept the hardware changes. According to Ramforum, roughly 80% of failed deletes trace back to missing or inadequate tuning ^[1].

CCV Reroute (2013+): The Crankcase Ventilation system needs rerouting to prevent oil vapors from re-entering the intake post-delete.

Buying piecemeal is how guys end up with a delete pipe that doesn't flange correctly or an EGR plate that requires grinding to fit. A matched bundle removes that headache entirely.

The Diesel Dudes' full delete bundles are built around specific Ram year ranges — 2007–2009, 2010–2012, 2013–2018, 2019–2021, and 2022–2024 — so every component is spec'd for your exact truck. Each bundle covers the DPF pipe, EGR block-off hardware, coolant reroute, and DEF disable, with tuner options available at checkout.

Here's a quick comparison of bundle tiers:

• 2007–2009 Bundle: EGR-focused, simplest install, no DEF hardware needed — great entry point
• 2013–2018 Bundle: Most popular platform; includes CCV reroute, full exhaust pipe, complete EGR kit — estimated 50–80 HP gain with tuner
• 2019–2024 Bundle: Built for the updated ECM; requires current EZ Lynk firmware — don't cut corners on tuner selection here

Price ranges run $800–$1,500 depending on year and exhaust diameter (4" vs. 5"). Add an EZ Lynk Auto Agent 3 for complete ECU management and selectable power maps.

Both tuners are proven on the 6.7 Cummins platform. The decision comes down to how deep you want to go and whether you're doing this yourself or working with a diesel shop.

EZ Lynk Auto Agent 3 — This is the workhorse choice for most Ram owners. It ships preloaded with delete maps that cover DPF, EGR, and DEF disable in one flash. Selectable maps let you run a low-smoke tune in town and switch to a high-power map on the highway. The wireless OBD-II connection means no laptop required. Works on 2007.5–2021 Rams with the right firmware version — the 2022–2024 trucks need the latest Agent 3 release.

EFI Live AutoCal V3 — Built for tunability. A skilled calibrator can extract 100+ HP from a 2013–2018 6.7 Cummins with EFI Live and custom injector timing, fueling curves, and boost targets. The tradeoff is that generic preloaded files don't perform nearly as well — this tool shines with a proper custom tune from a diesel-specialist calibrator. Budget $1,500+ for the full setup including calibration fees.

Ramforum members consistently recommend EZ Lynk for DIY installs and EFI Live for shop-tuned builds ^[1].

Buckle up — here's the actual install sequence most Ram owners follow:

1. Prep: Lift the truck, drain coolant, scan and document any existing DTCs before you start pulling hardware.
2. Remove the DPF: Unbolt the factory DPF and CAT assembly. On some 2013–2018 trucks the DPF is stubborn — penetrating oil on the flange bolts the night before saves knuckles.
3. Install the delete pipe: Bolt up the 4" or 5" race pipe using the factory flanges. Slide rubber hangers through the grommets before connecting — it's much easier that way.
4. EGR block-off: Install block-off plates at the intake manifold and EGR cooler. Route the coolant bypass lines and tighten all fittings — this step requires care. An air pocket in the coolant system causes overheating.
5. DEF disable: On 2010+ trucks, plug in the DEF simulator or prepare for the tuner to handle it via ECU programming.
6. Tune flash: Connect EZ Lynk via OBD-II, select your delete map, and let it flash — roughly 10 minutes.

Total time: 2–4 hours for an experienced DIYer. Refill and burp the coolant system completely before starting the engine.

Exhaust diameter is one of those decisions that feels minor but actually matters at higher power levels. Here's how to think about it for your build:

4" exhaust is the right call for 90% of owners. It flows enough for stock-to-mildly-modified 6.7 Cummins engines up to roughly 500 HP, fits cleanly under most Ram body configurations, and is easier to route on short-bed and cab-and-chassis trucks. The Diesel Dudes' 4" DPF/CAT delete pipes are bolt-on for 2007.5–2024 Rams and weigh roughly one-fifth of the stock DPF assembly — that's a meaningful weight reduction under the truck.

5" exhaust makes sense if you're running injector upgrades, compound turbos, or targeting 600+ HP. The larger bore reduces backpressure at high exhaust flow rates that a 4" system starts to choke on. It's also the better choice if you're running a full turbo-back exhaust rather than a delete pipe only.

On cab-and-chassis trucks, confirm pipe length and hanger position before ordering — C&C configurations vary and sometimes require an extension section or custom hanger placement. Adding an optional muffler keeps exhaust tone near-stock without requiring a tune revision.

This is the part of the conversation that matters, and we're not going to gloss over it.

Under the federal Clean Air Act, removing or disabling emissions control devices — including the DPF, EGR system, DEF/SCR system, or DOC — on any motor vehicle operated on public roads is illegal. The EPA enforces this actively, and fines for individuals can reach $5,000 per violation. Tampering penalties for commercial operators are significantly higher.

State-level enforcement varies widely. California, Colorado, and several northeastern states run visual emissions inspections that will flag a deleted truck immediately. Other states have no roadside emissions testing at all. Knowing your state's rules is non-negotiable before proceeding.

From a practical standpoint: a deleted truck will fail any OBD-II emissions scan because the DTC codes for missing DPF and EGR components will be present without a proper tune. Even with tuning, visual inspection catches the missing hardware.

Delete kits sold by The Diesel Dudes are intended for off-road, race, and competition use only. If your truck never sees a public road — dedicated tractor pulls, off-road rigs, farm equipment — the legal calculus is different. Know your use case and your local laws before you order.

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.