This is one of those rumors that's been around for some time, but only just a few days ago was it fully confirmed by someone who knows a thing or two about Porsche. That individual is Porsche CEO Matthias Muller, who, in a recent interview with a German publication, confirmed that a new turbo four flat-four is currently in development. It will officially serve as at least one of the engine options for the next generation Boxster and Cayman.

The pair currently comes with a choice of two six-cylinders, as per Porsche tradition. Unlike the new Le Mans-bound 919 Hybrid, which is powered by a V4 engine, this new turbo flat-four will retain the traditional Porsche 180-degree horizontally opposed layout. "We will continue with the downsizing strategy and develop a new four-cylinder boxer engine, which will see service in the next-generation Boxster and Cayman," Mueller stated. When asked about output, Mueller said the new turbo four will produce up to 395 horsepower. For comparison, the top-end 3.4-liter naturally aspirated engine found in the just unveiled Cayman GTS produces 335 hp (325 in the Boxster GTS).