Not Ranked
I simply tape over the cooler. As outside temperatures get warmer or I race the car, I peel off the tape. It's simple, light and doesn't break or leak . . . did I say cheap. 
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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