I just got a custom full 3'' exhaust installed on my '02 bug eye. It has an oval magnaflow muffler and 4'' double wall tip. It isnt too loud but very deep and throaty sound. If you want to quiet it down even more just throw a resonator on it. It will quiet it down but still have the patented suby grumble. I paid $300 for the install and the oval muffler tucks up perfect and looks stock. Go to any exhaust performance muffler type shop and it will be way cheaper and better than buying a cat/turbo-back system.