I know the guy who owns Rennkuh. They are based near Frankfurt. He's forgotten more about tuning BM's than most of us will ever learn!
And he's a nice guy by the way.
Bernie www.stahlkoffer.com
I've just added a Featured Bike article to my website on a Runnkuh R1200GS
.....actually they're not strictly speaking BMW R1200GSs:
They're built from scratch...Due to the substantial changes on the frame, the engine modifications and to be able to register the different noise emission values, compared to the stock GS, Michael Welsch is registered as well as the manufacturer of the bike. Legally it is not a “BMW R 1200 GS”, but a “Welsch GS12” now. This gives more freedom to use parts, that would not pass the German technical inspections, when mounted on a normal GS. Something where most US bikers would have no issue anyway. But Germany is Germany! Do not alter what the manufacturer has built, unless it is tested and retested!