Be Wary... there was a few details sent in to either ADB or Dirt Action Magazines in Aust. where a guy had put a small Garrett turbo on his KTM 640 LC4 hard enduro that had been converted to supermoto.
Apparently all went well on the wind up, but at full noise, the velocity of air through the carb kept the slide forced open, I reckon the solution was simply to add heavier spring to the carb slide.
Azza.