Mine is a Turbo Diesel and when I did the Ram Air setup I got an improvement engine response, power & economy, that is because delivering a higher pressure to the turbo, means the turbo is using less power to suck the air in.
On a gas engine ram air and CAI can help, but not as much & depending on your stock setup & tune maybe not at all. On most gas engines I have looked up they are all inclined to draw in cooler air, even those with intake in the engine bay, if you look carefully you will see they will be positioned to draw air that is slipping past the radiator, or some other holes in the front panels. Hot air is good to get the car warmed up, but cooler air is better once up to temp. I know a lot of people claim better FE with a Hot AI, can't say anything on that, but being so easy to do, I would think that all cars would just be set up in stock form for Hot AI from the factory if it was better.
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