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I think a warm air intake would be considered a severe bad idea on a diesel. It would be bad to get the exhaust gas temps up too high and fry the engine. Besides, the idea behind WAI on a gasser is to reduce pumping losses, which are nearly nonexistant on a diesel (or a throttleless gas injection engine for that matter.)
You might play with blocking/partially blocking the intercooler to see the results. Read a thread on a diesel forum where a guy discovered better economy by blocking off the intercooler in the colder seasons.
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 RIP Maxima 1997-2012
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Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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