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We're comparing engines with different turbos at the same boost, or the same turbos in different condition but the same boost. So the volume you compress your mixture to is fixed. The amount of air, in molecules, is the amount of power you have available. Pressure helps you get more air in but isn't a primary input (because pressure can be made from fewer, hotter molecules). Temperature also doesn't directly affect it (it makes your mix less dense, but boost increases it). For a given physical engine, it boils down to how much air. All the other factors just go into determining how many bits of air you get into the space you have to work with. An NA engine takes a volume of air and puts it into a smaller space, so yes your molecules are "worth more". But your NA's physical dimensions are constant, so the same rules apply and n is still your variable. You don't have boost, but stuff like how restrictive the intake is and what the ambient temp is all go into how many air molecules you fit into your given volume, and that is your fundamental limit on power.
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