2003-2005 5.9 Cummins HP TUNERS Custom Tuning SupportHP tuners device sold separately Unlock Up to +180 HP and Transform Your 5. 9L Cummins! Experience massive gains in power and acceleration with custom tuning engineered for performance and efficiency. Choose from five optimized power levels to match your driving style: Level 1: +30 HP Great for daily driving Level 2: +60 HP Light towing and improved response Level 3: +100 HP Ideal balance of power and drivability Level 4: +140 HP High performance