2017-2023 6.6L Duramax L5P Parts Collection

The best option is a full bundle that pairs hardware with proper tuning. Owners typically choose kits that include:

• Downpipe-back exhaust systems.
• EGR delete hardware matched to the 6.6L L5P.
• A tuner with L5P-specific files.

This combination ensures consistent airflow and stable ECM behavior.

Note: all diesel delete parts are intended for off-road use only. Always check local laws. 

Pricing varies by configuration:

• Full 6.6 Duramax delete kits: from $3,488.
• Performance race or delete pipes: from $385.
• Tuners: from $1,367.

Prices change over time, so owners should confirm current totals before ordering.

Yes. A 6.6L L5P cannot run correctly without disabling DPF/DEF/EGR routines and updating fuel maps. A tuner or unlock-and-flash tool is mandatory for all 2017, 2018, 2019, 2020, 2021, 2022, 2023 trucks to maintain proper turbo behavior and throttle logic.

Removing the EGR system eliminates the recirculation path, keeps soot out of the intake, and drops intake temps under towing by 20-40°F. On most L5P setups, owners typically see 10-25 HP added from cleaner airflow and more stable boost, and up to 150 HP with aggressive race tuning. Heavy-load trucks also show more consistent EGT control.

Installation difficulty depends on the shop tools and workspace. A standard DPF/DEF/CAT-delete exhaust can take several hours because of the large factory system. After hardware installation, tuning must be applied. Most installs follow this order:

• Load the L5P delete tuning.
• Remove OEM emissions components.
• Install race exhaust and clamps.
• Add EGR delete hardware.