I too have the borla and deleted the resonator. The drone got to me after a trip from Missoula to Moab. I put on an aftermarket resonator after that and right away noticed a difference - yes, it is quieter now. But zero drone - much more comfortable in the cabin. The weird thing is that I always feel like it is too quiet because I remember what it sounded like before, but everyone that rides in my truck comments about how loud and badass it sounds. I guess we sometimes lose objectivity when we get desensitized to the sound.
If you don't mind me asking, what model of aftermarket resonator did you use?