There was a time when all of Porsche’s mid-engined offerings came with the distinctive growl of a six-cylinder engine. However, with the 718 opting for a more economical turbocharged four-cylinder, some enthusiasts complain there’s something missing in the noise department.

While we already knew that the company is working on a new 4.0-liter flat-six for the returning GT4, rumors arose that the engine could make its way into less-hardcore variants of the 718 after a basic-looking Boxster was spotted during cold weather testing earlier this year. Porsche has apparently kept at it, as another 4.0-liter Boxster test mule was spotted at the Nürburgring along with a non-GT4 Cayman, according to autoevolution. (Read More…)