Already so got the Eisenmann Race on...took only an hour so I was only out $75 to get it installed! I love the sound though I do think it is quite a bit louder than the Eisenmann Race for the e46 M3. There is definitely some drone at around 2k rpm, but nothing bad unless of course you drive at 2k rpm all the time in every gear. For someone like me, the sound is just about ideal in terms of volume/loudness (perhaps just a bit on the loud side even for me). If you are used to a louder exhaust then the Eisenmann Race is a great choice. But if you are someone that does NOT like loud exhausts then go with the Sport.
2012 Audi R8 V10, 6MT, Suzuka Gray, Capristo X-Pipe, Klassen M52R, GMG springs, R8 GT tails, Satin Black badges
2012 Audi A6 3.0T Prestige, Moonlight Blue
2015 BMW X5 35d, Mineral White
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