2025 Duramax 6.6 Tuning

2025 Duramax 6.6 Tuning. Expect improved fuel economy, better towing performance with edge calibrations engineered and developed by diesel guys. Due in large part to the new 10 speed.

Ppei’s tuning can transform your l5p duramax, offering quicker acceleration, enhanced towing capabilities, and a more enjoyable driving experience. I just purchased a new 2025 3500hd denali ultimate.