Sorry Shy Torque, both of these are wrong.
at low rpm/larger throttle openings the atmosphere will win
A normally aspirated engine can, even at full throttle, only ever have at best, ambient atmospheric pressure in the manifold
Suck, Squeeze, Bang, Blow, is the Ottoman Principle so the inlet pressure MUST be below atmospheric in an unsupercharged engine unless you use ram air irrespective of the rpm or throttle opening.
An example is the old vacuum windscreen wipers used on car in the fifties. At high rpm and closed throttle they went like the clappers but at any rpm with the throttle wide open they slowed to a crawl, but they still worked. They didn't stop mid swipe and go backwards.
The more you supercharge the engine the more air and fuel you can force in; the more you can squeeze and the bigger the bang, so much so that it the exhaust gases aren't cooled so when it comes out of the exhaust the stubs are glowing. There's so much of it that you can use it to drive a turbocharger and so push even more fuel/air in and then you have to use an intercooler to keep the turbine in one piece.