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I have never understood why some think the engine compartment needs to be vented. Doing so certainly doesn't cause the engine to run any cooler. We don't do that with our desert Jeeps where temps get really hot.
I like your custom made hood vent. Subtle and different. Very nice.I decided to do the hood vents, but I like to DO things not buy them....so I found a TJ hood for 30 bucks and cut my own out. Yes they serve nothing but cosmetic looks but I like it. I cut them on both sides.
It might not be cool but it sure does look cool!