X pipe first, then replace muffler with two smaller mufflers, on each side, like the older v6 fusions had. then tune. I think in this order you might figure if drone is a factor. Good luck and keep us apprised. Remember this is just my opinion.
If you try and search on youtube, you can find a few guys from 2GF with their muffler deletes. They actually sound pretty good to be honest for what it is. I was thinking of doing this and depending on how that went, if I needed to, add an aftermarket muffler like magna flow, x pipe, glass pack, etc. I'm probably not explaining that right but if you find the video, you'll see what I'm talking about.
I found one of the links of a 2GF member: