Before you spend tons of money and then not like the sound, why not try this
remove the rear cats,, remove the resonator. this will not interfere with emissions , but will increase mpg and hp . a muffler shop will most likely NOT remove them so find a small out of the way shop to do it.
most on here say any and almost all aftermarket exhaust has a drone when cruising at any speed. remove the cats Not both on the same day drive it for a day if you don't like the sound remove the res. ,, you have 4 cats the front 2 are set up with 02 sensors, the rear two cats are not secsored so they can be removed search

search::::::resonator delete lots of info there.