Guys, I'm looking at the options for fitting a Milltek exhaust to my forthcoming (I still haven't found the right one yet!) S4, and wanted to canvas opinions about the differences between the full system and the cat back version, in both resonated and non-resonated guises. I'm not looking for a performance gain as such, really just a better noise, especially when your giving it some! But without being too intrusive at motorway cruising speeds. My current feeling is the cat back non resonated version? But reading a few threads here seem to suggest it isn't worth it and to go for the full system? I'd appreciate any advice/opinions?