Good friend of mine used to have his own shop and did custom exhaust. He used a lot of the Jones mufflers. Never had a complaint that I know of and the ones I heard all sounded good.
Never had a pair of em myself...biggest they make is 3".

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax