The range of Porsche’s entry-level 718 Boxster and Cayman sports cars is about to get wider as the company is planning to add a faster variant to sit above the Boxster and Cayman S models.

Our spies caught a prototype of this more powerful version, rumored to be offered under the GTS moniker, being tested on public roads.

As you can see, the car is still not wearing most of its final bodywork, with Porsche adding an extra spoiler lip under the front bumper in order for the prototype to get the downforce expected with the final production body kit.

The chassis will get upgraded with a lower and stiffer suspension and different wheels, while there’s also going to be a new sports exhaust.

While the previous GTS was only 15 HP more powerful from the S, Porsche is now expected to widen the power gap between the two, mostly because of the latest four-cylinder turbocharged 2.5-litre engine. With the current S currently offering 350 HP, the new GTS is expected to pack at least 375.

Porsche will offer the faster, more capable Boxster and Cayman with a manual gearbox as standard and the PDK dual-clutch as an option. As for the Spyder and GT4, these will reportedly continue to use a naturally aspirated flat six engine.

Photo Credits: CarPix for CarScoops

PHOTO GALLERY