Do not cut off the cats, IMO. Back pressure that is crucial for these engines to produce power will decrease. Indeed it will sound a little louder, but I prefer power over loudness.
I have a SOHC, with 2.5 piping after the last cat, then a Flowmaster Super 44, then 2.5" duals under the bumper. Sounds great and has very little resonance. More piping=less resonance. The sound is deep and throaty until high RPMs, but that is to be expected, it is a V6 lol.
But as Morris suggested, I as well have been hearing people are enjoying their MBRP systems.
-2011 F-150 Lariat: 5.0 "Coyote" V8, 6-spd Auto (6R80E), 3.73 ELocker. White Platinum Metallic Tri-coat.
-1992 Ford Ranger: 4.0L OHV, 5spd (M5OD-R1), 3.27 Open.