Is it a 2006 model, or was it built in 2006?
KTM release there models very early, so a bike built in the later half of 2006, would actually be a 2007 model.
My 02 640 was has a build date of 01, my 00 EXC was built in 99, and my 03 525 was built in the last few months of 02.
Edit, just saw you looked up the frame number, so it is an 06... I'm no help then...
A KDX is way cooler than what ever you ride...