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Gas engine power is controlled by throttling intake. If you reduce pressure drop across an air filter, for example, you’ll just have to close the throttle by same amount so engine makes same power. Total pressure drop is the same for all practical purposes. Again, talking about how it affects MPG and not maximum power.
As stated before, cooler intake temperature makes a theoretical efficiency gain but it’s so minor for a few degrees that you’ll never notice it or be able to measure while driving. A lot of claims are driven by marketing, not reality.
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