This is custom tuning for the 6.4. This is for in shop tuning only. Bring your truck in and we will tune your truck. Custom tune options include DPF on/off, egr on/off, horsepower levels from stock up to 300 additional horsepower. Tunes custom written for each truck based on truck mods. You have up to 90 days to bring the truck into the shop to get it custom tuned.