DIESELR 6.6L GM Duramax LLY All In One Kit (2004.5-2005)DIESELR Duramax LLY 6. 6L All In One Tuning Kit (2004. 52005) All In One LLY 6. 6L Duramax Kit for 2004. 52005: Full Tuning & Exhaust Solution The DIESELR 6. 6L GM Duramax LLY All In One Kit (2004. 52005) is engineered for GM 2500 3500 trucks equipped with the 6. 6L Duramax LLY. Designed for owners who demand real performance, this kit delivers full tuning control, exhaust upgrades, and the essential components needed for efficient power and