I have a 2006 YZ450F. I love it. but lately I have been feeling like i would like some more power. I ride 99% sand dunes and i just feel like i could use some more midrange. i have heard alot of people say on their 08 or 07 it made a huge difference putting a pipe on it, but with the 06 it only made a minor difference. point is idk if i want to spend 600 to 800 dollars on a new exhaust only to realize that i don't fell 600 to 800 dollars worth of improvement in power. Is the 06 exhaust good enough? Is there some other exhaust that will make a huge difference? Is there some where else i should be spending my money on this bike to help the power out that would be more noticeable than the exhaust? The most valuable information you guys can give me would be advice from other 06 owners, as i have heard the 07 and 08 stock exhausts are different.