VANCE AND HINES PART # IS 12530 ssr-2 . The site does not list it as available for a gs but they are on ebay.
Discontinued, possibly? Selling old stock on Ebay to clear out inventory space probably.
this one?
(http://home.planet.nl/~luppe018/exhaust.jpg)
The SS2R was available as a slip-on for the GS. I think you had to modifiy the stock pipe to use it, but I won't swear to that.
No Spaz, thats the Supersport. They are talking about the SSR-2. It;s the oval one.
-Anti