Duramax HD Duramax 2017–2019 L5P/L5D

Every product is confirmed to fit the trucks named on its page. If your year, cab or chassis config is unusual, call us and a tech will confirm fitment before you order.

Custom kits are made to order. Allow 5–10 business days before shipment. Tunes are delivered by email first, typically within 2 business days.

Some late-model trucks need a factory security bypass before tuning. If yours does, the kit includes the unlock hardware or we'll flag it before shipping. Call a tech if you're unsure.

Most customers do. Basic hand tools, a driveway, and the included step-by-step guides are enough, and our techs walk you through the flash by phone if you want backup.