I have a 1992 325i sedan (E36). Whenever I open up the throttle, I never feel like I'm getting enough power to the wheels, I can't decide if I want to get a limited slip differential or a performance clutch and lightweight flywheel. The ones I'm looking at are pretty close in price so value isn't really an issue. Which offers the biggest night/day increase in performance? Whichever I go with, I want to install it myself, a friend's uncle knows transmissions and can guide me through the clutch/flywheel, but how difficult is it to swap a differential? Not the whole thing, housing and all, but the diff itself. Anyone know of any online DIY instructions? Thanks, sorry this is so long.