Glovrin--- where in the California do you live? What was your magic to get a plate on your 2006 WR450F? The general consensus in the San Diego area is forget about trying to dual sport 2005 and newer WR450F's, the DMV here is up to speed on the EPA sticker situation.
I second that. I have heard of several people able to do it but no one experience is the same as the other. Mostly it is a dealer that is willing to check off the box that says Street instead of OHV. The other is a friendly or stupid DMV clerk. All I know is I am getting one and I want to ride the hills behind my house.