New spy shots have revealed a prototype of the car, which is understood to be based on the current Cayman and not the facelifted model due in late 2015, undergoing tests on both the road and track.
Visible in the pictures is more aggressively styled bodywork, compared to the standard car. Revisions include a new front bumper with larger air intakes, a new front splitter and a prominent rear spoiler – akin to that used on the 911 GT3.
Also evident is an additional cooling duct just ahead of the bonnet and large ceramic brake discs. The car appears to sit lower than a standard Cayman too, further bolstering the car's high-performance and track-focused appearance, and rumours suggest that it may also be lighter.
Rather than using the same 3.4-litre flat-six engine of the Cayman for power, it's thought that this sportier version may adopt the 3.8-litre flat six used by the 911 Carrera S, although tuned to produce less than the 400bhp of that car. Power output is mooted to be between 360-380bhp for the GT4.
The Carrera S is capable of completing the 0-62mph sprint in 4.6sec, and has a top speed of 188mph. Despite being less powerful, expect the GT4 to show significant improvements on the Cayman S's 0-62mph time of 4.9sec. Porsche's PDK dual-clutch automatic transmission should also feature.
Reports have suggested that Porsche has been planning to produce a hotter version of the Cayman for some time, with some suggesting that the model would carry the GT3 or R badge. However, it is now believed that Porsche will keep the GT3 badge exclusively for its halo 911 model.
The previous high-performance version of the Cayman, the R, ended production in 2012 – and was one of our favourite sports coupés.
Expect the Porsche Cayman GT4 to make its debut at some point in 2015.
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