My work colleagues (one of them own RSV and another - GT650) sent me a link to performance tuning shop in Germany - they say they have used this company for their bikes and very happy about it. I guess they did ti to Hawk (GT) but anyway - impressive stuff, shop does 5 staged tuning with top-notch stage producing 130 bhp and 125 Nm at rear wheel from Storm engine, but they actually making big bore mods in top version to 1120 cc. And: they give at least 1 year warranty on their work.
Just interesting. One day I may go for it. But only with bigger fuel tank
http://www.thiel-motoren.de/Start.htm
Don't complain it is in German - I don't speak it too, use Babelfish
If you go to Tuning section and scroll a bit down you will find dynoruns for those modificaitons