bbmcomputersolutions

Hi guys, I'm new to the forum and was wondering if you could please advise; I currently have a Boxster S and i am contemplating getting an audi s4 either b6 or b7 however I know absolutely jack about them, is there anything I should be looking for? any common faults etc? I've heard some about chain rattle on these but I don't know too much?! Any advice would be absolutely super!! Thanks peeps!