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Well don't know what vehicle you want to race but I have done several 24 hr races and a Miata is hard to beat and cheap. Pick the right tire and rotate every four hours, no need to change brake pads, and it runs out of fuel right at 2 hours so you can double stint and only stop for fuel, then every four hours change drivers fuel and rotate tires or you can change drivers every 2hours and fuel. Four drivers works good and you will need 4-6 crew. Does the Thunderhill race a straight 25 hours or like some tracks do 12 daylight hours on two days? Need radios or special horn to notify pits your coming in in a lap or two. My 2 cents
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