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Question:

whats a cold air intake do?

i bought a used Mazda MX-6 and other than cosmetic additions the only thing added was a cold air intake and a exhaust, what will a cold air intake do? hows it work?

Answer:

Cold air intakes my give you 3 or 4 horses more depending on your tune. It is designed to come with a free flowing air filter sometimes mounted inside the fender well or away from the heat of the engine. The air travels through a solid tube to your intake. The incoming air is supposed to be cooler.
Colder air is more dense than warmer air, so it slightly improves the combustion process. It is also better quality than a stock intake, so it is providing more air for the engine. as long as you have exhaust to accommodate that increase on the other side of the engine. Most stock intakes pull air from the engine bay, which can get quite hot. Relocating the front of the intake outside of the bay (and with a better filter and piping) provides colder air and more air than otherwise. The gains depend on how poor the stock components were. Some cars gain considerably more than others from simple bolt-on modifications. Some cars have gained a 5% increase on a dyno from a CAI, but your car comes stock with a better intake than the one I'm talking about.
Its nothing really crazy, it jsut draws air from a little further away from the engine. The idea is that cooler air will be denser, with more O2 for a bigger explosion. For everyday usage, I haven't found cold air intakes to be all that beneficial. Mag intakes however, which use the forward momentum of the air rushing against the car to cram more air into the engine, can be successfully used for a little extra HP especially in turbo'ed engines.
well, don't know where you'd find 'em, and if you did, they'd be very heavy and hard. they would kill your ride, handling, and gas mileage, not to mention causing more wear on the rest of the car.
Ain't goin' to happen Bubba !

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