The 6.7L Cummins diesel engine is equipped with emissions systems such as the EGR (Exhaust Gas Recirculation), DPF (Diesel Particulate Filter), and DEF (Diesel Exhaust Fluid). These systems are designed to reduce emissions but can limit performance and increase maintenance. A delete kit removes these components for specific uses, such as off-road or racing applications.
What a Delete Kit Does
A delete kit for the 6.7 Cummins typically includes:
- EGR Delete: Removes the EGR valve and cooler.
- DPF Delete: Replaces the diesel particulate filter with a straight pipe.
- DEF Delete: Disables the DEF injection system.
Most delete kits require a tuner to prevent error codes and engine limp mode.
⚠️ Note: Deleting emissions equipment is illegal for on-road use in many areas. These kits are for off-road or competition use only.
Why Owners Use Delete Kits
Delete kits are used for the following reasons:
- Reduce engine temperatures
- Improve fuel economy
- Increase horsepower and torque
- Prevent soot buildup
- Eliminate issues with sensors and emissions-related failures
Best Delete Kits for 6.7 Cummins
1. MM3 + RaceME Ultra Tuner Kit
- Supported Years: 2007.5–2021
- Includes: MM3 tuner, EGR delete, DPF delete pipe, tuning files
- Features:
- Multiple power levels
- Preloaded delete tunes
- Supports EGR, DPF, and DEF deletes
2. H&S Mini Maxx V2 with Full Delete Kit
- Supported Years: 2007.5–2012
- Includes: Mini Maxx tuner, DPF delete pipe, EGR delete parts
- Features:
- Plug-and-play tuner
- Monitors engine data
- Limited to older models
3. Flo-Pro Delete Kit + EFI Live Tuning
- Supported Years: 2010–2021
- Includes: 4″ or 5″ delete pipe, EGR block-off, custom EFI Live tuning
- Features:
- Custom tuning required
- Stainless steel piping
- Tuner and license needed
4. Sinister Diesel EGR Delete Kit
- Supported Years: 2007.5–2018
- Includes: EGR delete parts only
- Features:
- No tuner included
- No DPF or DEF support
Things to Consider
1. Vehicle Year
Kits are model-year specific. Make sure the kit matches your truck.
2. Tuning Required
A tuner is needed to disable emissions-related codes and ensure proper operation.
3. Intended Use
Use only for off-road or race applications. On-road use is not legal in most areas.
4. Cost
Full kits with tuners range from $1,000 to $2,500. Installation costs may add another $500–$1,000.
5. Installation
Installation requires mechanical skill. Improper installation can cause issues.
Summary of Options
| Kit Name | Years Supported | Includes | Tuning Type |
|---|---|---|---|
| MM3 + RaceME Ultra | 2007.5–2021 | Full delete + tuner | Preloaded tunes |
| H&S Mini Maxx V2 | 2007.5–2012 | Full delete + tuner | Preloaded tunes |
| Flo-Pro + EFI Live | 2010–2021 | Pipes + custom tuning | EFI Live |
| Sinister Diesel EGR Delete | 2007.5–2018 | EGR delete only | None included |
FAQs
Q: Is deleting my 6.7 Cummins legal?
A: Not for on-road use. Off-road or competition use only.
Q: Will it void my warranty?
A: Yes, emissions deletes usually void manufacturer warranties.
Q: Do I need a tuner?
A: Yes. The engine will not run properly without tuning after deletes.
Q: Can I install a kit myself?
A: Yes, if you have mechanical experience. Otherwise, hire a professional.
