If you thought installing a Porsche 911 engine into the 718 Boxster and Cayman range was the right move, check out Stuttgart's next mid-engined project.
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Not happy to rest on its laurels, it looks like Porsche is continuing development of its already quick 718 Cayman GT4 – with an even more purist-focussed GT4 RS variant.

As with the previous round of spy photos taken in September 2019, this latest round comes from Nurburgring testing.

Visually the differences are few, however extra information has surfaced on the Porsche GT4 RS’s potential, thanks to a report from Car and Driver in the US.

While the regular Porsche GT4 runs a 4.0-litre naturally aspirated version of the 992-generation Porsche 911’s 9A2EVO flat six engine, the Porsche GT4 RS will be tweaked to lift it beyond the current 309kW/420Nm outputs with as much as 373kW expected.

If that were to be the case, the Porsche GT4 RS would eclipse the previous generation Porsche 911 GT3, which claimed 368kW from its older 4.0-litre flat six engine, however there’s little doubt any new Porsche 911 GT3 would comfortably distance itself from the less expensive Porsche Cayman.

A more conservative 336kW target has also been suggested in some circles, giving a fairly broad possible spread for whatever the production version ends up at.

Compared to the regular 718 Cayman and Boxster models the GT4 has already been comprehensively re-worked with a wider front track and a range of 911-based suspension and rear axle components to handle the extra urge.

The GT4 RS isn’t expected to change any of the chassis hardpoints, however an even lower, stiffer suspension layout is likely adopted. Weight will be stripped from the overall package as well.

Unlike the enthusiast-appeasing GT4 which is available solely with a six-speed manual transmission, the GT4 RS caught on test displays a tell-tale set of silver paddles behind the steering wheel (visible above and below), pointing to a PDK dual-clutch automatic transmission. PDK availability is expected to extend to the 718 Boxster Spider and Cayman GT4 before the end of this year.

The car captured on this occasion is sporting red brake calipers, suggesting the use of the GT4’s regular composite brake package instead of the ceramic composite setup spotted on the last outing. Although the GT4 RS might be the most track-oriented 718 model, it looks like buyers will still need to dip into the options list for some of Porsche’s most track-ready hardware.

Externally, the GT4 RS features the already bulked-up styling from the regular GT4 including specific front and rear bumpers and wider side intakes. Additional RS touches see bonnet vents added up front, engine-feeding air intakes in place of the side-rear windows, and an unmissable upsized rear wing, the final design of which should move to something a little less ungainly.

While the prototype shown wears minimal camouflage, testing and calibration appear set to continue for some time, with an official reveal unlikely until later in 2021.

Australia

A Porsche Australia spokesperson told CarAdvice there would be no “comment or speculation on future product” which, given the long lead time facing this model, comes as no surprise.

With high performance and low-volume variants of Porsche’s other model ranges in high demand locally, it would be highly unlikely for Australia to miss out.

Since we published this article, a reader advised us that Porsche dealers in Australia are already accepting deposits for the 718 Cayman GT4 RS.

When we put this to Porsche Australia representatives, they said the company has an "expressions of interest" program, but this was not confirmation a particular model is coming.

So, make of that what you will, but we're betting this model will come here, albeit in limited numbers.