My trans. 3m input shaft, all hardened clutches, 7/8", 3.29s, etc etc. It made a massive difference due to the gearing change and its worked great through tons of abuse. Its the only mod I've done that didnt lead to more problems and more annoyances. Literally the only mod I can think of.
Like my CF hood I love but it was a total PITA to get working right. My LED interior lights are nice but i broke two interior light covers doing them. My headers were a pain to get to not leak, as well as the rest of my exhaust. With all the mods I have almost everyone one of em' has caused problems and annoyances from time to time. The tranny has done nothing except maybe hurt mpg a bit. When I drop to a 2.8 with e85 and heads itll probably start to become more likely to be troublesome, but for now its been great.
