Hey Guys, I bought an 05 wr450 about a month ago, it has a bills pipe, AIS removed, throttle stop fixed, air box mod, but the guy never touched the gray wire. I asked him why and he said it had decent mid range as is and didn't feel the need for it. I have read in a few places that the gray wire mod will not help the canadian versions? I've tried searching in other places because search is disabled here currently and can't find any info...Just wondering if anyone out there knows if it does make a difference on the Canadian versions and if I should try it.. One other question, I asked him if he jetted it after the mods, he said it didn't need it? I have read almost everywhere that you need to rejet after opening up both ends...Should I rejet?