exhaust is available for the 300zx as a cat-back kit yet? (go ahead nixit, bash away :o) ) and if so, are the pipes stainless steel or that junkie aluminized metal? are they true 3" pipes? Are the tips 120mm or 130mm? I know what most ads say(75mm/2.95" pipe 120mm/4.9ish tip, but i also know the supra version is huge and the integra version is teeeeny, so I wasn't sure.