No, my idea was to use the actual BMW regulator. Those bikes get a lot of hours put on them and are pretty reliable, so that might be a good alternative if you're having problems with the electrosport products. The 400W stators were only the GS Dakar models, or something like that. I remember the parts fiche mentioned the power rating when I looked. From memory, the GS regulators are quite a bit bigger than the KTM one, but that makes sense if they can handle a lot more power. There is some space between the carb and the starter that might work for mounting one. You might also want to run the regulator output leads straight to the battery, as the stock wires are very thin.