Our spies have sent us a fresh batch of photos with a more hardcore Porsche Cayman rumored to receive the "GT4" designation.

We know Porsche is working on a facelift for the Cayman but they are also cooking up a hotter derivative which will be slotted above the GTS version. While the latter packs a 340 HP punch from its six-cylinder 3.4-liter boxer engine, the GT4 edition is believed to come with a larger 3.8-liter twin-turbo rated at 450 HP (331 kW). This sounds a bit over-optimistic but be sure the GT4 will be significantly more powerful than the GTS while possibly weighing less.

Matching the added oomph will be a more aggressive body which will include a fixed rear wing as seen on the prototype spotted here which also has ceramic brakes and an additional front air intake. There are also talks of a track-only version which will be positioned below the 911 GT3 Cup but nothing is official at the moment.

The road-going Porsche Cayman GT4 (name not confirmed) will probably be unveiled next year together with a facelift for the lesser models.

Gallery: Porsche Cayman GT4 prototype flaunts its rear wing in latest spy shots

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