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What is the reason? Either additional air coming/directed in through cracks or increased airflow from the opened assembly now not obstructing the usual intake is my guess.
I opened the headlights. And the engine actually did run 5° cooler. I'm impressed. I didn't think that it would work.
Dude, you think that works well, try taking the hood off and going for a hard run. Thinking my 190 degree thermostat never opened. You have a valid point. Hard to get fresh air to the bottom breathers.