2004.5 - 2005 GM 6.6L LLY Duramax | Engine Tuning by PPEI

Gain 120+ HP over stock, tow your toys effortlessly, and rapidly increase acceleration. Tuning engineered for optimal efficiency and the best potential fuel economy!

• STOCK TRANS
• Level 1: +15 HP
• Level 2: +30 HP
• Level 3: +60 HP
• Level 4: +100 HP
• Level 5: +120 HP

• BUILT TRANS
• Level 1: +30 HP
• Level 2: +60 HP
• Level 3: +100 HP
• Level 4: +160 HP
• Level 5: +230 HP