Collection: 6.6L Duramax L5P (2017+)

Why Upgrade Your L5P Duramax with a Delete Kit?

The L5P platform is one of the most powerful Duramax engines ever built — but factory emissions systems (EGR, DPF, DEF) often limit its full capability. Over time, these systems can clog, trigger check engine lights, or reduce fuel efficiency.

A delete kit helps eliminate those issues. You’ll get improved throttle response, cooler EGTs, better towing performance, and fewer regen cycles. It’s one of the most cost-effective upgrades for diesel longevity.

Just keep in mind: all delete kits are sold for off-road use only and are not street legal in most states.

Choose the Right L5P Delete Kit Based on Your Use Case

Every driver’s needs are different. Here’s how to choose a delete kit based on how you use your truck:

Daily Driving – Reliable Power for Everyday Use

If you use your L5P Duramax as a daily driver or work truck, you’ll want a delete kit that keeps things smooth and reliable. Look for setups that reduce regen cycles without throwing codes or making your truck overly aggressive.

We recommend kits with conservative tuning and quiet exhaust configurations — perfect for city driving, long commutes, and light-duty hauls.

Ideal options include:

2020 L5P Duramax street-safe delete combo

Low-smoke EGR/DPF delete kits for 2018–2021

Towing & Heavy Load – Duramax Delete Kits Built for Torque

Towing big loads? You need a kit that’s built to handle heat and stress.

A towing-optimized delete kit will help reduce exhaust backpressure, drop EGTs, and maintain torque under heavy throttle. Pair it with a towing tune and you’ll get smoother uphill pulls, better transmission behavior, and increased reliability.

Recommended picks:

2019 L5P full delete + tow tune bundle

Heavy-duty 4" exhaust kits with race tuner support

Off-Road & Performance – Full Delete Kits for Max Flow

When you’re pushing the limits off-road or on the track, emissions systems just get in the way.

Off-road delete kits are built for full power output — unrestricted flow, fast spool, and maximum turbo efficiency. Most of these setups require an unlocked ECM and a race-use tuner.

Best for:

High-horsepower builds

Track use or aggressive off-road setups

Users running aftermarket turbos or downpipes

L5P Duramax Model Year Compatibility

We support all major L5P model years with direct-fit delete kits:

✅ 2017 L5P Duramax delete kit

✅ 2018 Duramax delete kit

✅ 2019 L5P delete kit

✅ 2020 Duramax delete kit

✅ 2021 L5P delete kit

✅ 2022 Duramax delete kit

Note: The 2023 3.0 Duramax is a different engine platform. Please verify compatibility before ordering.

Top-Selling Delete Kits for 6.6L L5P Duramax

Need help choosing? These are some of our most popular picks:

Full L5P Delete Kit + Race Tuner (2017–2021) – Great all-in-one package

2020 Duramax EGR + DPF Combo Kit – Built for daily/towing

Towing-Ready Delete Kit for 2019 L5P – Cooler EGTs, improved response

Off-Road Full Delete Kit with 5" Exhaust – Maximum flow and sound

All kits are designed to be bolt-on with basic tools, and most include clamps, gaskets, and instructions.

FAQs

Q1: Is the L5P delete kit legal for street use?

A: No. All delete kits are strictly for off-road or race use only. Using them on public roads may violate EPA and state emissions regulations. Be sure to check local laws before installing.

Q2: Do I need a tuner with my L5P delete kit?

A: Yes, absolutely. Without a tuner, your truck will throw codes and go into limp mode. A tuner disables the EGR/DPF/DEF systems in the ECM so the truck runs properly after the delete.

Q3: Which delete kit is best for towing with my Duramax?

A: If you're towing heavy, go with a kit that includes a tow-safe tune, heavy-duty exhaust piping, and strong EGT control. These setups protect your turbo and transmission under load.

Q4: Will deleting my L5P Duramax void the warranty?

A: In most cases, yes. Any emissions modification will likely void your powertrain warranty. If your truck is still under factory coverage, you’ll want to weigh that risk carefully.

Q5: Can I install the L5P delete kit myself?

A: Many of our customers install delete kits at home with basic tools and mechanical experience. Expect 3–5 hours of labor. If you're not comfortable working under the truck or flashing the ECM, consider a pro install.

Q6: What kind of fuel economy gains can I expect after deleting?

A: Most drivers see 2–4 MPG improvements, depending on driving habits, tune, and terrain. You’ll also avoid regen cycles, which helps reduce downtime and fuel burn on long hauls.

Q7: Does a delete kit increase engine noise or smoke?

A: It can, depending on the exhaust size and tune. A full delete with a 5” exhaust and aggressive tune will definitely be louder and produce visible smoke. If you're after a more subtle setup, go with a 4” system and mild calibration.

Q8: Is there a difference between 2017 and 2021 L5P delete kits?

A: Yes. While the engine is similar, some sensors, ECM configurations, and mounting points changed between model years. Always choose a kit that lists your exact model year for proper fitment.

Q9: Can I still pass emissions testing after a delete?

A: No. Once deleted, your truck won’t pass any OBD2 emissions test or visual inspection. These kits are designed for vehicles used exclusively off-road, at the track, or on private property.

Q10: What happens to check engine lights or DEF warnings after the delete?

A: With a proper tuner and delete kit, those lights will be disabled or removed from the ECM entirely. Your truck won’t ask for DEF fluid again, and regen cycles will stop completely.

Still Not Sure Which Kit Is Right for You?

No problem. We’re diesel people too — and we’re here to help.

Click below to get a personalized recommendation based on your driving style, model year, and power goals.

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