OK guys, I hate to do this but here we go again, another exhaust question. I have read almost every thread on exhausts but would like input on my specific situation. I have a Canadian 2004 WR450, currently running stock exhaust, with stock insert. I don't really want to spend big bucks on a new pipe so....... I tried the bike without the stock insert and it was way too noisy. So I bought a used YZ pipe this winter (haven't tried it yet) but am thinking I made a mistake buying this pipe. Will the YZ pipe be as noisy as the uncorked WR pipe? Does the YZ pipe have a spark arrestor? Maybe I should have spent my money on a new insert, either a GYTR or a ProMoto Billet. But which one do you guys prefer? Any used inserts sitting on a shelf out there? So go ahead and flame me, but please share your opinions too. Thanks.