I wonder why your engine bay gets so hot for the both of you. I shouldn't have a problem placing my hand directly on the hottest part of my hood after a run.
What you said about the hood shaking before you installed the louvers confirms my thoughts. I'm just hoping it's a significant difference because 90% of my driving is on the highway. A 1 mpg increase at 60 mph would be very good. The payoff from gas savings though would take about 15 months.
I did think about putting in hood spacers which would be similar to removing that rubber piece. I don't think that would be as effective though, and maybe dangerous in a front end collision.
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