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I don't know the Tundras very well, most of the people I know while they off-road they prefer the smaller vehicles for the most part.
But anyways, for our part of the country, look at your airflow into the radiator, and the airflow out of the engine compartment. If you improve flow out of the engine compartment and add a patial grill block you might actually improve cooling while improving aero. On my Jeep I vented the hood (it tended to get hot anyways), on my pickup I am looking at venting out the wheel wells.
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