hey any one know how much a 2.5 inch exhust should be i got quoated $450 2 day

How long is a piece of string? :D

It depends what you want. Mandrel bends cost more than press bends. Stainless steel costs more than mild steel.

Are you getting it from the cat converter back, or does it include a new cat? Are you getting a new muffler too? What kind?

yeh new mufler mild steel new resignator or somthing like that as well with the same cat

Sounds like it could very well be a "Redback" system. If that price includes fitting - then it's not bad.