To clarify, if you have a system that gets cold air, you will get a gain of about 1-1.5% per every 10 degree drop of intake air temp vs hot underhood air. If you made that system a ram air, it would only improve about .5-1 percent total.
If you get the pressure change that the ram air creates, you can calculate the power gain easily and you will find the the air density is incresed more by dropping the temp than the slight gains the ram air makes.
Of course Ram air is good and helps but its more important to get cold air by a factor of almost 2 in most cases.
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