I as well bought an 06. When my friend with an 05 first saw it he said " 80 changes my ass". He has +2 A-arms with Elka shocks, Hot cams, CDI Rev-limiter box, head porting, DR D slip on, and K+N filter in the stock air box. The first thing he said after riding mine when it was stock with exhaust baffle out was, " Wow thats a totally different bike, thats amazing that its the same bike but feels so much different. "Since then I put DR. D slip-on, ESR intake, No cam mod, and an air fuel meter for tuning and We raced tons of times up comp hill and on flat dirt roads. My bike is dead even with his he is so pissed. Up comp hill we run side by side all the way up. We have the exact same back rims and paddles. On the flat road his does seem to pull on me at the end of 5th, may be due to the higher rev limiter. He had his dynoed at Custom Cycle - ATV 1704 North Country Club Drive,Mesa AZ. It had 44 HP.
Get an 06 you will be glad you did, but then again when the 07 comes out I bet you'll wish you would have waited for that Can't keep waiting forever.