Hi everyone, sorry if this sounds familiar but I did read a lot of the threads and I still have no answer for my question, and here it is: Would a 2006 450cc yz's full exhaust system fit on my 2004 wr 450? I heard that the pipes are different from yz to wr, and that if I was to get the yz can, I'd be better of with it's own pipe also. Any thoughts??? Been looking at all the free mods lately and wanting to do a lot of them on my bike. The one issue that bothers me the most is the exhaust. I have to keep it quiet around where I live but also want some performance. I've decided I would not hack up my oem exhaust and get the yz's and maybe quiet it down a bit as they are (supposedly) loud. Thus , having the choice depending on the type of ride. Thank you all!!!