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Small battery like an Optima or DynaBat. Big $$ composite racing seats. Carbon fiber body parts instead of fiberglass. There are even ultra light gages from AutoMeter. If you are considering a roll cage go with chromemolly tubing, it's more expensive but stronger so the tubes can be thinner wall and smaller dia. and saves about a third or more of the weight of a mild steel cage.
Light weight, trick stuff is not cheap.
ken
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