Some automakers have done twin-turbo four-cylinder diesels, and before you jump down my throat about it, BMW’s "Twin-Power Turbo" engines use a single twin-scroll turbocharger. Not two ...

The Biturbo is the model in question, and it is important for our story for two reasons, 1) it was the first twin-turbo automobile to be mass-produced, and 2) it made landfall in America in 1984.