Finally got to drive my buddy's Ram last week (been beggin' him for weeks, lol), but me, personally, I like the sound of the Flowmaster. Yes, you can hear it inside, but to me, not aggravating at all on his HEMI, just depends on personal preference. My '81 had it (already installed when I bought the truck so I can't take credit for the mod, only for enjoying it
), but I didn't find it distracting at all and I had the 318 in mine, so no MDS. Haven't really had any experience with the Magnaflow, but from the sounds of it, lol, (no pun intended), might be the way to go if you want it quieter in the cab.