I've got 40's on the Charger and love them, put dynomax on the wife's Chally, they are ok, but..............a bit tiny for me, maybe it's just the small block 360, but it's built reasonably "hard" ? Anyway, for the r/r 440+6 I just went to summit and brought 3" all the way back with series 40 Flowmasters..............hell with the neighbors, besides they love the sound of the Charger, they are always egging me on to rev it up and smoke the skins,lol. :thumbs: