2004.5-2006 GM Duramax LLY EFILive AutoCal V3 Custom Tuning

Cooper Custom Solutions (CCS) offers true custom tuning for your LLY Duramax. After you supply us with your information, we can supply you with tuning that is tailored to your truck and its specific usage.

CCS is a trusted Canadian tuning company that is one of the best custom tuners for Duramax.