Collection: 2019-2026 Duramax 3.0L LM2

3.0L Duramax LM2 — Tuning, EGR, Exhaust & Fuel

Calibrated tuning, EGR upgrade kits, exhaust, and fuel hardware for the 2019–2026 GM 3.0L Duramax LM2. The 3.0L Duramax (LM2) is emissions-heavy from the factory; builds focus on calibrated tuning and off-road emissions hardware. Every part here is matched to your truck and ordered the way you'd build it.

What you need to tune the 3.0L Duramax LM2

A supported device (EZ Lynk Auto Agent, HP Tuners MPVI4, GDP Commander) plus a Dieselr-calibrated tune file — GDP and Chaos Custom Tuning calibrations are also available. EZ Lynk requires no send-in.

Exhaust & off-road hardware

Downpipe-back and turbo-back exhaust in aluminized and stainless, plus Cat & DPF race pipes for off-road and competition use. Larger-diameter exhaust lowers EGT and frees airflow as power climbs. EGR upgrade kits include block-off plates, coolant bypass, gaskets, and EGT provision. Off-road and competition use only; pair with a matching calibration so the engine runs correctly.

Fuel

FASS, S&S Diesel, Dynomite Diesel, and Dieselr fuel hardware support higher fueling as power climbs.

Compatibility

Organized by confirmed fitment for the 2019–2026 GM 3.0L Duramax LM2.

FAQ

What do I need to tune a 3.0L Duramax LM2?
A supported device plus a Dieselr-calibrated tune file. Add off-road EGR and exhaust hardware if your build moves past the factory emissions configuration.

Do I need a tune with an EGR upgrade kit?
Yes — the calibration prevents fault codes and derate after the hardware change.

What fuel upgrade do I need?
Stock-to-mild builds run the factory system; higher power calls for added fuel supply and supporting hardware.

Are EGR upgrade kits and race pipes street legal?
These products are intended for off-road and competition use only. It is the buyer's responsibility to comply with all applicable federal, state, provincial, and local emissions laws.