I have D&D and I have nothing but praise for them I don't think they are loud but O that is right I'm not the one in back.
Just ordered the D&D show and go chrome bolt-ons for my '05 Busa. $450 delivered from parts411.com. Everything I've heard about the Yoshimura slip-ons is that theyre terrific pipes, but really don't change up the volume that much,. and only give a 1 or 2 HP gain, plus theyre gonna run about $600 for the RS-3 Oval Stainless. I want to change the stock exhaust for a louder pipe that isn't going to cost me a fortune, and if the bike only has a 1 or 2 HP gain or loss, I'm honestly not going to be able to tell the difference on this rocketship. Plus I've heard D&D pipes on other bikes and they honestly don't sound that loud unless they are really getting jumped on. I'll let you know how they work out.