04 450 with FMF Q4 jetting?

My nephew recently purchased an 04 450 with only a couple of hours on it. It has the stock muffler and jetting. I bought him an FMF Q4 exhaust, any jetting suggestions? He usually rides between 1500 and 5000 ft.

Thought I would give this another try, any suggestions on jetting?

Thanks for the link, it will give me a starting point.

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