I am not sure what the drone is. I put duals on this weekend, the 4" MBRP turbo back system and it is quiet, almost like the stock, except a hint of rumble down low. It sounds almost like the stock system, on a normal easy, takeoff, but if you hammer it, it comes on like a tractor trailer. I can keep it quiet to about 75 in cruise. That is a little over the 2100 drone zone, but it don't have it at any speed, but it will get loud over that, as you are starting to boost some. But it's not an annoying drone.