You CAN greatly reduce the drone on the Magnaflow by replacing the rear cats with a X-pipe which also cuts out some restriction from the cats.
I have just the magnaflow on my N/A and the drone diminished some with break-in.
I run the x-pipe (in place of the deleted rear cats and "H" pipe) in front of the resonator with the muffler deleted on the SRT6 with no drone at all, but WOT is a whole different story.