Originally Posted by DGthe3
GM powertrain has a different set of rules that they have to play by than the aftermarket. Some of them are internal (such as engine longevity), some of them are external (emissions). But different none the less.
I understand that. I'm sure that is the reason. It just seems crazy to me that they can't just add a couple psi of boost and be done with it and still maintain basically the same reliability, emissions, and fuel efficiency.