Krane taht's true, but it is a competition'. It's MEANT to be in the same class.
cbsalkvist dunno, your ideas just don't seem so good to me... Too much NFSU-ey. In real life i don't tune cars, heck, i don't even drive (i'm 17, one year to go

). But yes, you wouldn't just tune the engine and leave everything stock (well, unless the rest was good enough). And somehow making another, 'tuned' class would seem to me as ripping apart the game. It just would, don't know why really...
And tuning was suggested a lot, always unsuccesfully.It just wouldn't work. If you want turbo pressure, cam and mixture richness controled, someone will want suspension geomtry controlled (the shape of the arms, bolting points, etc.). Will then everyone design their own car? Sure, it works like this in the real life (except in Formula Ford or simmilar classes where they basically all drive the same car). But look at that. GTR for example, when Maseratis came out, they totaly owned every other car! If you have the same car for everybody (or purposely made class that has an intention of being even), the racing can be much closer. As i said, i just don't see this as a good idea...