The latest claims suggest the range-topping Cayman will get up to 400 horsepower.

Porsche is allegedly on track to reveal its rumored Cayman GT4 in production form early next year.The track-focused Cayman will be built at Porsche's Weissach plant, with production likely to begin by summer 2015, an unnamed source has told Top Gear, citing information from a dealer.

The latest information suggests the GT4 will provide 380-400 horsepower, likely from Porsche's 3.4- or 3.8-liter flat six. The details appear to contradict the claim of 450 ponies that accompanied the earlier leak, which pointed to a twin-turbocharged mill.

If the dealer specs prove accurate, Porsche may be leaving more of a gap between the Cayman GT4 and the 911 GT3, which squeezes 475 horsepower from its 3.8-liter naturally-aspirated engine.

The range-topping Cayman is expected to be offered with a choice between a paddle-shifted PDK transmission or a manual gearbox. A track package with a roll cage and racing seats is also a possible option.

Porsche is expected to debut the Cayman GT4 by February.