Interesting. That reminds me of something I've heard on Jeepforum or NAXJA.... Some people report a gas mileage improvement when they add a snorkel, even with the extra drag of the pipe going along the A pillar. I dismissed it, but it seems reasonable now.
My Cherokee's air intake temp gets up to 130F so there would be a big difference with a snorkel or better engine bay venting
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