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Have heard recommendations
A couple of my friends have cool suits in their Spec 911's and say they are nothing short of awesome in the heat.
I suppose it's worth analyzing whether the weight cost of the cool suit plumbing and ice chest full of ice water is better or worse than the horsepower penalty from an AC compressor (and its weight). My guess is the water chest weight cost is less. However, AC has the advantage of being usable if you drive your race car to the track in hot weather.
I know one guy who uses a much cheaper bit of kit (though it looks well-made) that amounts to a vest with lots of slots/pockets for custom fit popsicle-sized freeze packs. Not sure how quickly they can be re-frozen or if it comes with a day's supply of packs.
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