I've been scouting the web, hoping to find someone posting detailed pictures of their own GTS but no luck so far.
On another note -and I'm sure this has been discussed before- I find it really interesting how BMW used to make really cool custom parts on its special versions (eg: E36 GT, E46 CSL) but on the E92 they appear to have gone with stuff that is pretty much off the shelf.
Anyhow I found this pic of the suspension tool kit of the GTS. Those who have KW coilovers should be familiar with it!