The T-stat helps the shifts on my SRT Challenger. They are a lot crisper now. If I drive it any when its real cold out I get a code about it not warming up enough but the preditor will clear it. That's with a 180 T-stat.
I think I get my best 60' with tire pressure at 35psi. Been hi 1.7's. and 7.70's in the 1/8 at 91mph. All on a 275 wide BFG on the stock 20" rim.
Those numbers are at 5psi out of the Procharger.