I have for sale a pair of Staintune mufflers to suit an ST1100. They came with my bike when I bought it (a 1997 model) so I don't know how old they are but they are in good condition, no scratches, and they polish up pretty well. They include the decibel reducing end pieces so you can make them a little louder than standard by leaving them in or a lot louder (by removing them).
They fit straight on to the standard system, no gaskets required, and are easy to install. Re-jetting is not required.
A new pair costs $1300 but I am happy to let them go for $600, which I think is reasonable. They are in Bowral (NSW), an hour and a half south of Sydney. I am happy to help with getting them to areas near Canberra, Sydney or Wollongong. Anywhere further afield and you might need to organise to collect them.
First in best dressed.
Cheers
Woffo