We want cars that don't pollute. We want cars that are fuel-efficient. But do all the fancy electronics needed to squeeze 40 or 50 miles out of a gallon of gas mean we've compromised on safety?

Shopping for a car enthusiast is difficult. Buying car parts requires knowledge of the car’s year, make, and model. Probably more than that, and we haven’t even dug into the owner’s tastes. But, you ...