I’ve just come across this thread, I have a 2006 srt convertible, I got a s/s cat back exhaust made in the uk for £750 which included using the original tails so looks stock the sound is totally different and last week purchased the headers from Needswings ceramic coated being fitted in a weeks time(looking forward to that) after this I’ll be looking at sports cats. Cooling already sorted with the N/Ws large intercooler and isolation kit.