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Originally Posted by Willravel
It's mostly about increased airflow which makes the engine run more efficiently, but a decent CAI will have a heat shield, like this one:
http://www.steedafocus.com/store/Fue...duct_info.html
That heat shield means that the air coming in will be cooler, which means a theoretical increased efficiency. |
In theory that is correct but keep in mind he'd be doing this to a 2008 Ford Focus.
Any improvement that it
might make just wouldn't be worth it. Besides, if the dealership wanted to be a dick about it they could mess with his warranty because it's a non OEM part. On the right car with the right parts a proper CAI is a good idea, I just don't see this instance being one.
If this was a used, performance car I'd agree with you. This is a new economy car though.