I think ART pipes will be a good combo with FI TDX, I have FI 12" res and MD LTH with resonators and they sound great. Also, the drone has been reduced from when I had FI non-res HFC.
You can check here the sound
@1:05 and 3:47 and 4:40
and here from inside, I have slight drone around 2000-2200 which some times appears, I think due to having smaller resonators.