Collection: 2004.5-2005 Duramax LLY EGR Parts

6.6L Duramax LLY EGR & Off-Road Hardware

EGR upgrade kits and off-road emissions hardware for the 2004.5–2005 GM 6.6L Duramax LLY. Intended for off-road and competition use; pair with a matching calibration so the engine runs correctly. Every part is matched to your truck and the rest of your build.

EGR & Off-Road Hardware

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.

Compatibility

Organized by confirmed fitment for the 2004.5–2005 GM 6.6L Duramax LLY.

FAQ

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

Are EGR upgrade kits 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.