Outgoing head of R&D Wolfgang Durheimer said at the Detroit show: We have a four-cylinder boxer engine under development. He admitted that the unit can be applied to the Boxster and Cayman.
There was some indication that the sub-Boxster Porsche would borrow bits from a sister car built by Volkswagen and Audi, and while that route would certainly cut down on development costs for all three cars, Porsche seems to be bent on powering its version with a beating heart designed and developed in house. Sources said that the new flat four motor is 2.5 litres and can churn out around 360bhp in turbocharged form.
Durheimer said that for the time being, Porsche plans to keep to the flat-six for its bread-and-butter sports machine, the 911. However, there's no telling how long more this would hold.