Don't EFN worry about it
Funny you mention that a welder/fabricator I know has a 24 valve in an F450 he did the 51 inch big rig muffler he chopped it down to fit under the welding bed its still plenty long and it kills the noise the 24 valve makes pretty good inside its quiet no drone. He has a cam and compounds dont know if that makes a difference.I wanted to use the 51" Donaldson on mine but Ihad to raise the whole exhaust for clearance on my trucvk...so one that long won't clear the framerail.
My drone is bad too....that hard bedcover and 5" pipe exiting 6" off the ground are a recipe for noise.
It sucks...I've got a 10,000 dollar stereo system that sounds like a flea marketsystem when I'm driving. LOL
I'm really interested in that FTE resonator....looking forward to hearing what you come up with. If you can quieten down that X then I know I can beat the drone in my CC.
What is it you ordered from NAPA ?