you won't notice much of a difference if you're stuck in stop and go traffic. for the vent removal to actually make a difference, you gotta be moving. (now this is all said with the caveat of never having been to street vibes, but assuming it's gonna be a crowded affair).
the lowers actually help your engine to run a little cooler by funneling air over the cylinders. unfortunately, that hot air has to go somewhere, and that is usually over your legs. i remove the vent doors every year, and put them back on for the winter. i find that the extra heat with the lowers is well worth the extra protection/wind management that you get.
I understand the concept of reality, but find it too confining for a way of life.
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