Hot rodding used to be a pretty straightforward hobby. Once you'd mastered manifolds and camshafts, all you had to worry about was how to get the money for your engine parts and the grease off your hands. Then in 1981, Detroit, pressed to reduce emissions and improve fuel efficiency, started putting something new in their cars: computers. Suddenly, anyone who wanted to fine- tune an engine had to have a degree in data processing.
No problem. A lively market has now developed for so-called superchips, plug-in brains that replace factory-supplied engine chips and offer a variety of improvements, from better gas...
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