Cars are changing fast. The headlines are about electric vehicles. But something quieter is happening under the hood. Traditional engines are evolving too.

The unique demands of car racing have spurred various developments in automobile manufacturing. Whether in Formula 1, Le Mans, or on the street, people love a car with plenty of speed and performance.

It's one of those questions you've probably never thought to ask, but the second you hear it, it's stuck in your head. Automakers have produced cars with three, four, five, six, eight, 10, 12, and 16 ...