That is a Crf450. He has a great sense of humor & irony - as well as the balls to put an Aprilia sticker on there
They wouldnt let him run the Aprilia.....too scared it would win.....the same reason its banned from the AMA, and many other orgs.
BTW - the Priller SXV450 is completely dominating and currently holding all of the top 3 positions in the S1 World Championships and the 550 is in 2nd place in S2.
http://www.racingaprilia.com//superm...io.asp?id=1726