2017 - 2023 GM 6.6L L5P Duramax | Engine Tuning by PPEI

Smooth power

The heavy tow tune was exactly what I needed. It helps to the truck to run smoother with no dead pedal. Allows me to tow effortlessly.

Whole new truck

I bought the SOTF 5 tune and TCM tuning and this woke my truck up. I finally feel like I have a modern diesel. Even my wife, who drives more conservatively, commented on how it accelerates smoothly and actually does what she expects it to when getting up to speed. I bought this when HPT was having some issues unlocking the L5P but Logan and the rest of the team at PPEI were very responsive and I was in contact with them daily until HPT was able to get this resolved. Stuff happens but I never had a doubt that PPEI was going to see this through for me.

A good change

I've tuned my trucks with other tuners before and it was good I thought but Kory's tunes really woke this thing up. Quite pleased with it!