Frankly,
I find loud exhausts to be bad for everyone! They wake up your neighbors, get you tickets, and make the motorcycle community look like a bunch of a**holes.
Not running the stock pipe is understandable, on a performance standpoint, but just looking for the loudest pipe possible is irresponsible. If you want to do that, go get a straight pipe with a megaphone on the end. I know a couple of people that suffered hearing loss from loud pipes. You will lose a lot of performance just going for loud, and you will look like you are using your bike as a feeble mating call.
My personal opinion.