Just copied this guys setup.
http://www.zetecinside.com/xr2/incarcamera.html
Tested out on the track 2 weeks ago. Mounted the bullet cam on the bwr harness bar and put the camcorder in the netting. Velcroed the battery pack behind the drivers seat. Great video and no wind noise ( I duct taped ) the mic along the center console. The mic does pic up some engine noise when the engine is at full howl; I might try to splice a electret microphone in place of the the one that came with the bullet cam.
I need to edit some of the video as it has a bunch of misc. stuff in it, and try to post in on google or youtube.
Jeff