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The “Widowmaker” has been spied again, carrying some serious performance intent – the vented front wheel arches from the 991 GT3 RS have made it on to the GT2 RS test mule pictured here. Its predecessor ran 0-96 km/h in 3.5 seconds, with a top speed of 330 km/h – this new version should comfortably top that.

As the performance flagship for the 911 range, the GT2 RS can be expected to produce nearly 700 hp from a turbocharged 3.8 litre horizontally opposed six-cylinder engine, up from 620 hp produced by the 3.6 litre force-fed “Mezger” engine in the 997-generation GT2 RS. As is the nature of turbocharged engines, redline will be considerably lower than the GT3 RS’s 8,800 rpm.

It appears to adopt the centre-locking wheel design from the naturally aspirated GT3 RS, while the front hood and roof appear to share that car’s wide recess on those areas; as those components were made of carbon fibre and magnesium respectively, the GT2 RS can be expected to adopt these materials in the interests of weight saving, as per the modus operandi of Porsche’s GT-series cars.

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Despite the resurgence of the manual transmission in recent GT Porsches like the Cayman GT4 and the 911 R, the GT2 RS can be expected to pair its engine with a PDK dual-clutch automatic for speed, as Porsche expects most of its GT model customers to take their cars to the track.

The sheer speed that the GT2 RS is capable of is presumably the reason the company has decided to include the wheel arch vents once again, despite the difficult process in getting that section of bodywork type-approved and initially saying that the GT3 RS will be the first and last Porsche to have them.

When applied on the GT3 RS, Porsche’s GT division boss Andreas Preuninger said that the wheel arch vents double the level of downforce achieved compared to doing without them. Worth the additional trouble, then. Further to that end, the front of the GT2 RS also gains two pairs of dive planes on the front bumper.

Around the back, the GT2 RS mule appears to have concealed beneath the camouflage additional vents like on GT2s past, and the exhausts terminate in separate tailpipe units, as opposed to the centrally mounted one on the GT3, GT3 RS and 911 R. Last but not least, the rear wing appears yet to be finished but leaves no doubt about its track-biased intent.