Porsche has had its ups and downs when creating cars without using six-cylinder engines. We'll leave the Cayenne and the upcoming Panamera out of the discussion for now, though those models are scheduled to get hybrid powertrains in addition to V6 and V8 power. Starting with its 356 model, along with its many racing variants, the automaker has amassed quite a history of successful boxer-style four-cylinder engines. That history book may well get a new chapter as the European Union continues to clamp down on carbon emissions and the United States government takes a hard line on fuel consumption.
