Im starting to consider my options for an exhaust system so was looking for inspiration at the moment. Will be ordering a rear diffuser from the s4 as I wil be going with a dual exit system, really fancying some rs4 style tips on each side but would like to see what other options I have. Or could a rs4 diffuser be modified to fit? without it looking tacky like?? Would there be much if any power gain through a full stainless de cat on a turbo diesel engine?