I've been running the 91 octane Performance tune from Bama for a 6MT with no other mods for two weeks now...loaded at 1200 miles and now past 3400 miles.
No before and after dyno, butt meter says it's faster, the biggest noticeable changes are quicker throttle response, especially in neutral when matching revs for a downshift, and the 7300rpm rev limit which has actually kept me off the rev limiter ever since I loaded the tune...actually gives you enough time to shift when the tach turns red.