I've owned my st for 1.5 years now and I recently got the Cobb stage 1 accessport. Now I'm planning stage 3 with a big turbo 2867R but undecided on how big .64 or .86. I would like to get between 350 and 400. I also plan on installing lsd. I have some friends that say the .86 would spool up faster. Its also my daily.