(The Oracle @ Oct. 17 2003,09:58) I have an Akrapovic Evolution Ti full system. It is 4-2-1 made completely out of Titanium with a Carbon Fiber can. The system weighs 20 lbs less than the stock and sounds a bit deeper. It isn't louder than stock (you can hear it here:
here).
I did the install myself, and it was pretty straight forward. I only loosened the radiator instead of removing it, and I wish I had protected it somehow (perhaps with cardboard), because I dinged it up a bit.
I love my exhaust! With the lighter weight, and add HP, she wheelies much easier then before. And, I love the way the coloring changes on the Ti pipe. Plus the C/F can never gets to hot to touch. And, the bike doesn't kick the fan on unless it is really hot and I am stopped for prolonged periods.
-Rip