I have V&H Big Shot True Duals with the quiet baffles. The quiet baffles don't make the pipes noticeably quiter, but they make the tone deeper. They are pretty darn loud. They are louder than the Rinehart True Duals I had on before.
If what you want is noise and many more tickets for it, you need to create a megaphone. That is just a cone with no baffles to impeed the sound. It will be very loud, any metal shop should be able to create them, add $500 for chrome and wala - noise tickets.
I have Samson drag fishtails (no baffles). They are the loudest around. I was thinking of going with the fullsac dual system, which should make them even louder. If you have a radio, you might want to reconsider loud pipes. You will have a hard time hearing the radio. Heck, I use a mp3 with ear buds, and I can't even hear them, and they are in my ear. Loud, yes. And, everyone will tell you straight pipes will hurt performance, and I can not argue that. I can say that I felt no difference between my stock slip ons and my fishtails. I am very happy with them, and would only change them if, and when, I start thinking more about performance than style. BTW, the only thing that I do not like is where the right exhaust will yellow/blue at the start of the slip on. It is easy enough to clean, with blue job, but something else you might think about.