go into the forced induction forums, the guys there talk about transmission cooling, and valve boddies. Those are to keep the auto intact for boosting. To my knowledge the NA mods shouldnt be hard on the tranny. Mainly because they are not enormous gains that boosting does, and do not put much wear on the engine. It seems to me some of the NA stuff basically brings back the power that the engine uses on other chores. Such as how the exhaust opens up the flow out, so the engine doesn't waste energy trying to get rid of it.