I couldn't resist the car when I bought it because it was in such good condition. The only down side was the chavvy Cobra backbox,attached to a cat-back system built by Ascar exhausts in Sheff. After living with it for a year I think my 172 is giving me tinitus, it's soooo loud! What are my options for quietening it down? Will boxes from other manufacturers work with the system I have? It would have to be one that pokes out the back of the bumper though cos there's a hole in it now.