So the S4 needs more noise ! When I’m out of warranty I’ll be putting on a new exhaust and remapping. There don’t seem to be too many options out there at the moment so currently milltek looks like the main option (and not a bad one really). Obviously I’d want the unresonated option, to maximise noise, but thinking about tuning too, my question really is ..... how restrictive is the standard cat and down-pipe? Would a full system (turbo back) be necessary or will a cat back system give noise and options for more power? Anyone got any thoughts?