Someone clarify auto tune for me?

Just got my 2010 CRF450 and can't wait to ride it but i've been reading threads from Eddie Sisneros and I'm wanting to get a PCV and possibly the auto tune. Now I tune diesel trucks with EFIlive but this auto tune is a little confusing. Ok so you set what timing you want, set your target AFR ("perfect" afr for the fuel you use) and ride it. The bike will tell you what fuel map adjustments to make to your map? So in theory your bike will run MAX power all the time? If this is true and I want to have less power for any reason how would I get less power without leaning it out, decrease timing?

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