Its hard to explain drone but it is when you here the exhaust continuously inside the cabin and its like a humming sound going in and out. I didnt care about drone but if you have a family, reconsider it.
The reso is the can shaped muffler right at the end of the exhaust at the tip.
The BWoody is great...it is def louder than the airaid. butt-dyno is a go as well...seems to have a little more pep/pulls harder through 3K-5500 rpm's...and at WOT it is a lot louder under the hood. The filter does drop down quite a bit, so if you will be off-roading the AIRAID is a much better choice. Since I had both, let me know if you have any questions...I will have videos soon of both to post for comparison