I want to get more noise from my exhaust in the cheapest way possible. Having done some research I like the idea of replacing the centre muffler with xpipes. Am I right in saying the oem system is 2.25? (I hope so as I've just bought one on eBay) I've seen some you tube clips but none with a S4 B6 cab. Has anyone got a link they could post. Any tips, problems or suggestions gratefully received.