theres a good price on a wileyco....
http://cgi.ebay.com/ebaymotors/Suzuki-GSXR750-GSXR600-muffler-slip-on-exhaust-GSXR-750_W0QQcmdZViewItemQQcategoryZ35596QQitemZ4572918519QQrdZ1
This probably belongs in the for sale category, but since you opened this can of worms, I noticed a member of this board is selling one already attached to the GS500 header. I'm tempted, because I was planning on doing a stage 1 rejet in order to not deal with fashioning an exhaust... but this would be pretty easy...
http://cgi.ebay.com/ebaymotors/SUZUKI-GS500-PERFORMANCE-EXHAUST-GS-500E-500_W0QQcmdZViewItemQQcategoryZ35596QQitemZ4572725661QQrdZ1
If you have the means, I would highly recommend getting the Vance and Hines full system.
The reason I say that is: the stock pipe, when leaned over far enough, will grind on the pavement, and in some cases it pivoted the rear end off the ground :?
Putting on a different rear shock, my help prevent that, but the V&H is lighter also.
If you are not seeing these kind of lean angles,..... then skip everything I said :)
wow someone is gonna get a good deal...this exhaust would work great with srianth's flange if he still has 1