Aye Richard,
Just type "Skorpion exhaust" into the 'Search' window in the top right of the 'Thumper Club' page, click on the 'Search' button or hit 'Return' on your keyboard and lo and behold a whole lot of info and links to be browsed at your leisure.
Even though the standard can is like a large drain pipe, we never got round to changing it for something lighter and more raucous, fruity, afore selling the bike, so no personal recommendations.
All the best, Bill