I have a Supersprint cat-back system on my R36. I have the "sport/racing" centre muffler which is the slightly louder of the two available. All I can say is that I am extremely happy with it. Yes it is one of the more expensive options but I think it's worth it. The sound is great, the quality of the system is faultless and there is absolutely no drone. I have had mine on now for about 8months and I have had no issues at all.
2009 R36 Wagon | Icelandic Grey | Sunroof | Sat Nav | Reverse Camera | Dynaudio 600W | Automatic Tailgate | Tow Bar
Mods: Supersprint Cat Back Exhaust (Sport / Racing Centre Muffler)
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