there were questions about them......... and for you all Americans!!!! I found this kellermann in USA
Hope it helps and they have every needed accesories
(my suggestion is rigid mount!! dont ask me how I know )

Grzegorz ......55 cubic inches http://www.flickr.com/photos/25172906@N06/ 904WisecoTPUSAcamsTTPignitorgutted Airbox"breath"airIntakeKeihinCR-ScarbsBlackEpcoExhaustS/SwheelsPortedPolishedHead