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There is also math to back up the intake designs that have "restrictions" compared to a simple duct that gets air from one location to another location.
Sure math is based off mathematical theory, so not everyone believes in it, but there are a lot of well written books on intake design that use math and when those intakes are put on engines that they are designed for they work better and you can design that intake to work well at high revs so you produce more power or at low revs, but a poorly designed intake will make the engine work harder to produce the same amount of power.
But some don't like to pay attention to complex things like math and instead like the simple "less restriction is better" idea instead of designing something that really is better.
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