Drone can be eliminated if the exhaust manufacturer does some proper R&D on the system. My experience is that MBRP doesn't care about eliminating drone, their exhaust I bought for my Fiesta ST droned like crazy at highway RPM's. Swapped it out for a Mountune exhaust and had no drone.
No idea about the MBRP exhaust on the BS, but I had one of theirs on the 1.6l in my Fiesta ST and it droned like crazy on the freeway. Ended up swapping it to a Mountune that I loved.