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Question:

What does a cold air intake do?

Does it make your car go faster and/or have more power?- Is it what makes your car make the loud rumble noise , in the good way when you step on the gas?- Thanks (:

Answer:

It will free up the restrictive stock intake box. Stock intakes have resonators to reduce engine sound as the air is sucked in. So it will make the engine have a louder rumble sound. The cold air part means its pulling air from outside the engine compartment and not the engine heat, same as stock system. It does provide some hp increase. But keep in mind every thing works together. Air still passes through the throttle body and intake manifolds. So to gain full benifit from cai those items can be ported or changed for more performance and so on.
What is trying to be achieved is putting more air into the combustion chamber. The colder air is more dense and therefore we are hopping it will increase performance. But at what point could it be too lean? And is it possible with a cold air intake? How does it affect carbs vs fuel injection?
The colder the air the more oxygen it contains. All internal combustion engines make more power with the coldest air possible entering the combustion chamber along with the fuel. All cars in the past 20 years draw cold air between the left inner on outer fender. They already have cold air intakes from the factory. There are water drains in the intake air manifolding and trumpet bells on the entrance to cut intake noise. It does not make the car go faster! Top speed is limeted by the transmission electrical signal to the ignition system. All cars have a speed cut off point as installed by the manufacturer. The only noise you hear is when the throttle is wide open and air is entering the filter through the manifolding to the throttle body. The exhaust sound doesn't any different.

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