Every old hot rodder knows that the secret to making more hp is sound...the louder it is, the more hp it is making.
So, a cold air intake will be louder, therefor, more hp. Hot air, cold air, forget what the experts say, and all the thousands of hours that indicate cold air intakes are a waste of money, it's the sound that does it.
In the olden times, chrome also made more hp, so we chromed everything we could. But that no longer holds true as almost all exterior metal has been replaced by lighter plastic, so chroming is no longer necessary, as the weight savings negates having chrome.
Grumpaw