Well i was going to do some other mods, like a couple more airbox chnages and maybe a cam mod in the next year. plus i have a HMF slipon on my YFZ and it is great, i didn't feel like spending a couple more hundred dollars for a head pipe if it only added alittle power. But anyways thanks for the info. Also when is the final dyno of all the pipes togehter going to be up? I'm just wondering how the HMF and Yoshimura look since they both really good pipes.