Prototypes of the Porsche Boxster and Cayman have been spied testing on the 'Ring and both likely had four-cylinder engines.

Prototypes of the Porsche Boxster and Cayman have been spied testing on the 'Ring and both likely had four-cylinder engines.

Porsche chief Matthias Müller announced in May the next-gen Boxster and Cayman will be powered by a four-cylinder engine and judging by the different sound provided by these prototypes it seems testing of the firm's newly developed boxer motor has started.

A report issued last month said Porsche is working on three different four-cylinder engines, starting with a 1.6 that is expected to develop 210 bhp (156 kW). Up next is a 2.0 allegedly outputting 286 bhp (213 kW) and 399 Nm (295 lb-ft) while a 2.5 is rumored to generate 360 bhp (268 kW) and 470 Nm (347 lb-ft).

These three engines will be seen at first in the next generation Boxster and Cayman duo slated to come out in 2016 but will be added to other models before the end of the decade.

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