Well brentmann... funny thing you should ask. I did happen to get the Zoomers cat back. Ordered them up... installed them myself with the use of a neighbors rack. Installed in about an hour and a half... and they sound SWEEEET! You can check them out here:

http://www.zoomersexhaust.com/

I understand there are less expensive options out there... but the sound is just soooooo nice....