Jetting suggestions

I have a YZ450F 2007 and I need a little help. I put on a slip on FMF Powercore 4 and I would like some guidance on the jetting. I have the fuel screw out almost all the way but I know that it needs to be jetted. I live in the Las Vegas area about 2000ft elevation. What would be good so I can get the best performance out of my beast? Any help would be great thanks.

Well if your fuel screw is all the way out then definitely up at least one size on the pilot

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