Okay, so Saturday I finally got to ride my new toy with the after market exhaust. Firstly, bone stock I was not happy, but after they corrected the jetting I liked the bike with the stock exhaust. It pulled fine and and had a very smoothe power delivery. However, with the Yoshimura pipe I put on, all I can say is THIS BIKE RIPS!!! I was disappointed when after I ordered the pipe I found that yosh mostly delivers mid and top rev and not so much on the bottom. But after I installed it and rode it, it really opened up the bottom and gave me lots more mid and top. I dont know if I am riding in the rev limiter or what, but I do seem to be getting some sputtering at high RPM's, trying to find out how to fix that as I type this. Nothing that I think the bike is gonna throw off a face of jump, but it sputters. Not sure what more to say other then it just rips! I can ride longer thanks to the 08 suspension and now I can go faster, charge out of corners faster and I love the sound of the pipe. Typically I am a come in fast to a corner, lock the back break downshit to second and charge out, but now I am just hitting the corners in third and still have lots of power coming out of them. It could be that I am getting better at corners finally, but its probably the bike. for anyone that wants a 08 yz450 and are put off the bad press it has gotten, just get after market exhaust and you will love the bike!! I cannot wait to ride again this weekend, hopefully all the rain we have gotten drys up by then.