Originally Posted by chithead
4 mpg gain by adding heat reflective tape? I would seriously have to see it to believe it. Cooler air would increase HP and MPG, but my initial assumption is that heat reflective tape would just trap hot air under the hood.
I had the same assumption, but this guy tells me that the heat is actually forced out the bottom of the car. the link below is from a turbo BMW that he did. his product reduced the under-hood temps 560 degrees!