I just read the feb. edition of dirt bike mag. with the 2007 450 shootout and it really has me wondering about how the 06 and 07 yz motors compare.I usually dont pay a whole lot attention to what the magazines say,but to briefly quote what was said:"less than spectacular changes,most riders say it feels like a 390,and the yamaha has no real advantage over well,anything."These comments in the mag. have me wondering about my decision buying the 07 yz over the 06.I'm not saying that I'm not happy with my purchace,but having never ridden a 06 yz makes me wonder just how badass the 06 is.I have very few hours on my 07 yz and have not done any mods to it,not even jetting.Im getting ready to install the 170 main and 48 pilot I am sure the jetting will really wake up the bike.Now here is my question to all that have either owned both or ridden both the 06 and 07.How much different does the 06 motor feel compared to the 07 motor?How does the low,mid,and top end compare? I know alot of the difference is because of the stock exhaust,but it makes me wonder if its the exhaust or other internal changes.Also has anyone put a 06 exhaust on the 07 to see if that is the difference.