Welcome to the board. The D and D bolt-ons I think sound pretty good. They are louder than stock and has a nice growl to them. I haven't heard anyother exhaust on a busa so I can't really compare. I am now looking at the HMF dual high mount exhaust. I would recommend getting a full system in the beginning, instead of bolt ons. Most people get them for sound only, which I did the same. But now I am looking into performance and need to get a full system. So if you look for performance, save yourself the time and money, and go ahead and get the full system. Again welcome to the board.Hello been lurkin around in here and thought i would post because i got a ? i am waiting for the 05 busa. How louds is the d and d exhaust on the busa