I know this has been done a million times before, but I couldn't believe how easy it was and how well it turned out, so I thought I'd post some pics...I made this using .025" aluminum, a hacksaw blade, dremel tool, and some JB Weld...2 hours total. Getting the shape of the venturi for the template was the hardest part.
http://www.msnusers.com/KDXRidersCommunity/knoxkdx.msnw?Page=3
http://www.msnusers.com/KDXRidersCommunity/knoxkdx.msnw?Page=3