This is some good info, I need to check if the intake restrictor is still in mine. I got mine from the first owner without lights and don't think he ever did any modifications.
Seeing also that I was in Seattle when I picked it up and now live in Boise it might help it run a bit more like it did down at sea level.
On a side note I have been thinking of adding a headlight back to the bike for the occasional evening trail ride... If I do (still considering it) would this mod let me keep the trials mapping and have lights?