I really like my Eisenmann Race but it does drone a good bit between 2-3k rpm under load. If this is an issue for you I would go with the Eisenmann Sport. The Eisenmann exhausts are of superb quality and are not like other exhausts which basically have two generic mufflers with tips on them made to fit the e9x M3.
2012 Audi R8 V10| 6MT| Suzuka Grey| Dallas Performance Stage 1.5 Twin Turbo| 817whp pump| 950whp on 109 octane| GMG springs| Klassen M52R| Toyo R888R| GT Tails| GT wing| Black Optic Grille| Satin black badges
2015 BMW X5 35d|Mineral White| Mocha
2017 BMW M3 ZCP| Mineral Grey