A mysterious Alfa Romeo 4C prototype has been spied and it's likely a hotter version set to come out in 2015.

Towards the end of June we heard Alfa Romeo CEO Harald Wester hinting at a more powerful version of the 4C and chances are this is the car he was talking about. Likely to wear the Quadrifoglio Verde or Stradale moniker, the hotter 4C can be seen in these images featuring a more aggressive body sporting air intakes in front of the rear wheels.

Moreover, in the upper left and right corners of the front bumper there are extra air intakes while the side profile shows a new skirt. At the back there's a slightly redesigned bumper with different exhaust tips along with additional vents on the quarter panels, right above the circular taillights.

While the regular Alfa Romeo 4C packs a 240 HP (176 kW) punch from its 4-cylinder 1.75-liter turbocharged gasoline engine, the QV / Stradale is rumored to get as much as 270 HP (198 kW).

As a final note, a track-only version of this car is reportedly in the works. The road-going more potent 4C variant could be shown as early as March 2015 during the Geneva Motor Show but before that Alfa Romeo will launch early next year a 4C Spider featuring a black canvas roof.

Gallery: More powerful Alfa Romeo 4C Quadrifoglio Verde / Stradale spied for the first time

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