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The air filter will keep out any bad stuff. However cold(er) air is all about power and fuel economy. Back in the olden days of carbs and compromised mixtures, warmer underhood air was probably desireable for general drivability. Especially in the 1970s and early 1980s, when they were going with leaner mixtures, so put the little heaters on exhaust manifold to thermostatically have a controlled source of warm air. But with closed-loop computer-controlled fuel injection, that is no longer an issue. The input air temp is monitored, and the mixture adjusted as appropriate.
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2004 Alero GLS (and a few others)
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