From personal experience, Supersprint is very quiet and it really changed the sound of the car (mine didn't sound like a 335). I later changed to Autobahn Exotics which made a fantastic sound and the best thing was that it guarantees no drone so i liked it a lot.
One of the guys here also has a Remus exhaust on his E93 which sounds awesome. Eissenman might be on the loud side and drone is a big issue.
If you don't want to bother with the AE exhaust, I'd go for the Remus though the CF inserts are not my cup of tea.
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