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

Wow

I got the SOTF option. I will be leaving it on level 3 for daily drives. but the fact that there are two levels above this one when its "Time to Party" is insane, the power difference on my completely otherwise stock truck is awesome.

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.