The regu06r is my favourite exhaust I've ever had. Oem quiet when cruising but screams like a banshee when on it....especially with supercharger. It is a bit restrictive so don't expect big power compared to a 3" system but at the same time you don't have drone. As for the dc sports mani I've no complaints other than having to replace the flexi once in 40000 miles and at the minute it's knocking slightly on anti roll bar. Hasn't all the time though so could be to do with having sub frame off twice in 6 months.