Well my 1992 sc400 isnt running perfect yet but alot better ( always ran god just lacking some of its old spunk), it has had a new timing belt, new spark plugs, start of a bfi, tm engineering tranny cooler, new tranny filter, tranny fluid flush complete, high temp oil, a new air filter, a new fuel filter, and a valve balance...what this all means is i have shaved a little over a 1/4 second off my quarter mile, just back from the track. Not bad really but has room for improvement still.