K&N airfilter for WR426

I just purchased a K&N airfilter today and their kind of pricey but I think the quality was worth it. I may have to rejet they said so I just put the airbox lid back on and we'll go from there. :cheers:Hey is there anyone out there that can tell me which port is the vaccum port for the aircut valve so I can block it off? Oh one more thing what are these powernow valves? Do I need one?

I thought K&N filters were more for street use than off road?

I've gotta K&N in my car and I dont think I'd ever put one on YZF for the simple reason that I really don't believe it filters small particulate very well. I leave the filter on my car dirty as I think it works better that way..

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