Well, what did you expect? If you want no drone go with the Performance exhaust, meaning original dp.
Besides the obvious sound change, how much difference in performance do you feel?
Glacier Ag. F31 328iA M Sport oct. 2012
| Sport Automatic | Adap. M Susp. | Pano. Moonroof | 20" ATS Racelight Grey w. Michelin PSS| M Sport brakes | Harman Kardon | Elec. Seats | PDC F&R | ACC Stop&Go | 335i MPE | Perf. Parts |