Porsche has been spied testing what could be the first Cayman GT4 RS – a lighter, harder and faster version of our 2019 evo Car of the Year. Specific details remain sparse at this time, but it’s expected that the GT4 RS will follow Porsche’s traditional RS recipe of combining lighter components, more substantial aero and a slight increase in engine power to create the most exciting Cayman yet.
The GT4 RS should find its mechanical basis in the standard GT4, utilising a version of the naturally aspirated 4-litre flat-six that has also recently found a home in the Cayman and Boxster GTS. Power will likely be raised above that of the GT4’s 414bhp, but is unlikely to go significantly above that so not to encroach on the next 911 GT3 which we expect to see later this year.
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Since the 991-generation 911, all RS models of any derivative have only been available in PDK form, a trend we expect to continue with this GT4 RS. Standard GT4 and GTS models will also be available with Porsche’s seven-speed PDK later this year, joining the six-speed manual that both six-cylinder 718 models were launched with exclusively.
What we can see on the prototype, however, is Porsche’s significant changes to the GT4’s aero package, swapping out the standard GT4 wing with a top-mounted unit on chunky development stacks, similar to those also seen on 911 GT3 prototypes. The bonnet is also new, and mimics that of the previous 991.2 911 GT3 RS with it’s two NACA-style ducts and central crease which is new for the Cayman and Boxster ranges.
The wheels and tyres look to be of a similar size and style to those of both the current 718 GT4 and previous 981 GT4, making it unlikely that the Cayman will feature the 911’s staggered wheel size or centre-locking hubs. It is this wheel size and style that tells us this is a road-going variant however, and not a track-only racer in the style of the 718 Cayman GT4 Clubsport that is already in production. The rest of the bodywork is otherwise familiar from the standard GT4.
A more interesting adaptation on this mule is the replacement of the Cayman’s rear quarter windows with a set of vertical louvres. It’s impossible to know from these images whether they are functional or not, but if they are it would require a big change to the interior layout to incorporate a large high-mounted intake of any description, segmenting the engine compartment from the rest of the cabin in a similar way to that of a Ferrari F8 Tributo or Audi R8, rather than the standard Cayman’s open layout with the engine residing underneath a carpeted section. Look closely at the images and you’ll also notice the rear windscreen is also blackened from inside, adding further speculation to what a future Cayman GT4 RS’s interior could look like.
Porsche has not yet confirmed its development of this possible GT4 RS, but with Porsche’s GT division proving to be one of its most profitable, there is reason to expand on its mid-engined range, especially as the 992 911 GT3 promises to push the rear-engined flagship further up the performance spectrum. When a Cayman GT4 RS will arrive, and how much it will cost, remain the biggest mystery.