I keep track of my air intake temperature as it is related to the general under hood temperature. If it goes over 40°C on a regular basis I remove some of my grill blocking.
The reason (apart from having EGR, which adds heat and reduces the effectiveness of a WAI) is the battery.
Lead acid batteries don't last long if they get over 40 degrees.
My advice would be to choose the blocking in such a way that the 12V battery benefits from the air stream through the remaining unblocked parts.
And, of course, measure that under hood temperature. I used a cheap in/out digital thermometer before I got my UltraGauge.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
 lifetime FE over 0.2 Gigameter or 0.13 Megamile.
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For confirmation go to people just like you.
For education go to people unlike yourself.
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