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exhaust drone is actually a resonance, where the whole system is allowing the sound waves to basically "build up" and create the drone...kinda like blowing air over the top of an empty coke bottle.
and, every car combo is different! only way to figure it out yourself, is to experiment, change the length of the tail piples if you want, change the mufflers, add an H or X pipe, if you already have one, then try it without...
 I had that somewhat even with an H-pipe. Switched to an X-pipe. That fixed it.  I like the tone now, too. Can hardly hear the exhaust from within the car at cruise.
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