Depends what you're looking for. . I like mine quiet, so I went to our local big rig store and picked out a 4" id, 9" od, 32" long muffler that goes on big trucks. It's straight through, but has 3 chambers throughout the length for sound absorption. About half the sound of the first "straight thru" muffler I had that just had louvers. No drone, much more civilized. Don't have a brand, though.