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besides cooling the air, IC's also affect/restrict the air flow of the system because of the narrow width of the fins that the air is forced through. Just like a throttle body opening, the size of the IC will restrict how much air flow can enter the manifold. Similar to how an aftermarket exhaust reduces backpressure and increases flow to make more power, a larger IC reduces restrictions in the intake system and increases flow and cooling to make more power. However, if the IC is too large for teh application, you can lose PSI and air velocity which will hurt your power. So yeah, having the properly matching IC is very important. :)
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