I have some 20" turn-outs that I got cheap on jc whitney. they have a welded in, minimal baffle. When I first installed them I loved the sound, except for this tinny echo-y undertone that just kind of pinged along behind the rumble. I solved it by pulling the pipes and stuffing some steel wool in ahead of the baffles. That took out the ping-y sound but left everything else sounding the same. That was about 6 months and a lot of miles ago and so far so good.
