of what you mentioned i think dropping the suspension would get you the biggest gains, then i would also be all over doing smooth wheel covers on an s-10, most of thier wheels seem like they would be pretty bad aero wise. then switching to an electric fan, i dont know who at GM decided it would be a good idea to put a regular fan in a truck with a 2.2L.
biggest one i would be against spending money on would be injectors.
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