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Since atmospheric pressure doesn't change, and cars' displacements are fixed, we can normally consider VOLUME to be the "amount". For a turbo engine, 14.7 psi means you have twice the "amount" of air at the same displacement. We're now considering PRESSURE to be the "amount" of air. But that's only true with the same turbos. Bigger turbo means less heat and thus more density even at the same pressure. The "amount" of air is actually the NUMBER of molecules. That was always the case, we just pretended certain variables were fixed in the other examples, since they often are. Atmospheric pressure pretty much always is, effective intake pressure is on an NA, and quantity of molecules per pressure is at the same temp (on the same turbos). As you step outside of "typical" conditions, you un-fix those variables and can't take the same shortcuts.
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