Do diesels develop more power with colder intake air? I swear now that the air is cooler mine ('81 non-turbo) has more pep off the line.

I know that colder air is denser and a lot of 60's/70's gasser muscle cars used to have ram-air hood scoops and stuff, but does this also work on diesels?

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'81 300CD - 180K, cannot be killed by any conventional means
'99 Ford Escort - good MPG