i was reading about the honda insight, and the toyota prius. they use electric motors to assist when under load, because there gas engines are so small.....(i think you know where i'm going with this.)
has anyone came up with an aftermarked device that could do this on "normal" cars? i couldn't find any. some sort of electric motor that would attach to the rear wheels, a battery in the trunk, and button on the dash to activate/deactivate. (of course it would be more complicated then that. it always is.)
just an idea...