The water-injection system for your carburetor that the oil companies don't want you to know about! -- paraphrase of an actual Popular Mechanics ad circa 1978

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fho 2 hours ago | parent [-]

Joke's (partly) on you: https://en.wikipedia.org/wiki/Water_injection_(engine)

	▲	mikestew 2 hours ago \| parent [-]
		Oh, it's been proven to work, even in a limited number of production vehicles. Just not with what you buy out of the back of a magazine. :-)