been driving hotrods for 30 yrs now.. a ton of hotrods... exhaust has always been a balance of keeping it sane but nasty.. it's varied over the years from headers, glasspacks and turndowns to duals with a x-over and 50's..
I miss the old days when it was not much of a big deal, driving nasty stuff around.. I mean fock, Harley's have come stock loud as he!! forever.. nowadays they'll take $783 and your first born for running open headers......
but anyway, I wouldn't want anything bigger than a 50 series on a modified vehicle.. it's tame enough, but still sounds somewhat menacing when into the loud pedal... and it's a pretty large muffler as is, the super quiet stuff is too large for my logistical liking...