I have a 2002 Cavalier LS Sport with the 2.2L Ecotec. I installed the Hahn Racecraft Stage II turbo kit and the Patriot Stage II cylinder head. I am also installing water injection, an intercooler sprayer, and a boost controller. However, my PCM is fighting me and I know I get more out of my engine with either Megasquirt or HPT. I have never done any PCM or ECU reprogramming or tuning of any kind before. Which of these tuners would give be the easiest for me to use and allow to get the most out of my car without having to worry too much about ruining my engine.

Neither. The MS wasnt designed for our cars. The HPT was. But look on the bright side, there are ppl who tune and willl help you along the way. The HPT is the way to go.