this is prob a dumb question but i've noticed alot of ppl adding a "clutch kit" .... what exactly does this do, and can a do-it-yourselfer do the install? also, i've been thinking of doing the jet kit but wondering how hard it really is, and is it really worth doing? my main thing i'm looking at doing right now is a lift and hopefully sell my 26's and get 27's or 28's