I had the Flowmaster Super 44 installed on my 2021 1500 Classic 5.7L w/ 3.92 gears, super drone at highway cruising speed where I’m at about 1800-1900 rpm in 8th gear.
I put in the Flowmaster 50 HD and much less drone, I turn off the MdS at city/street speeds, and keep it on at highway speed (100-115km/hr here) and it’s not terrible but still some drone can be heard. But SO much better than the Super 44. Everything else is stock exhaust wise.
sounds great when heavy on the accelerator, fast take off etc. Nice growl, deeper, meaner sounding.
if you want to keep it cheaper and not a cat/back system I like the FM 50 HD. If I had unlimited funds though I might have gone for the Carven or Corsa systems, maybe Magnaflow cat back.