Why Putting a GT3 Engine in a Cayman Was Such a Big Deal
For years, Porsche kept the Cayman in a carefully managed position below the 911. The mid-engine car had better handling geometry, a lower centre of gravity, and a chassis that engineers and driving instructors alike would describe as more balanced. But it was always given less power, smaller engines, and a ceiling that kept it from threatening the 911’s commercial dominance. The GT4 RS changed that logic almost completely.
To understand why, you have to understand what engine they put in it. The GT4 RS uses the 4.0-litre naturally aspirated flat-six from the 911 GT3. Not a detuned version, not a related unit with shared architecture – the same 9,000rpm engine, producing 368kW in the Cayman’s mid-engine body. Porsche had to redesign significant sections of the 718’s rear structure to fit it. The intake system, which draws air through windows in the rear side glass, was an entirely new solution to the problem of feeding a motor that breathes this freely. The sound that results is something that photographs and video cannot adequately capture.
With the engine sitting immediately behind the driver, you hear and feel the flat-six in a way that is qualitatively different from any rear-engine 911. The intake note comes from directly behind your head. At 8,000rpm the car is genuinely loud from inside the cabin, and the noise carries a texture and quality that turbocharged alternatives simply cannot produce. This is the single most discussed aspect of the GT4 RS among people who have driven one, and the discussion is warranted.
The Handling Argument
Mid-engine cars have an inherent advantage in weight distribution over rear-engine 911s. The GT3 RS has been engineered to compensate for its rear weight bias through active aerodynamics, sophisticated chassis electronics, and rear-wheel steering. The GT4 RS does not need those compensations to the same degree. Its weight sits close to the ideal, front-to-rear and side-to-side, and the result is a car that feels neutral in a way the GT3 RS does not.
At the limit, the GT4 RS communicates earlier, rotates more naturally, and is more forgiving of small errors in throttle application mid-corner. This does not make it faster than the GT3 RS in absolute terms – the RS has more power and more aerodynamic grip – but it makes it easier to drive at nine-tenths on a technical circuit and more rewarding when you are not at the absolute limit of the car’s capability. This is why some experienced track drivers, people who have driven both cars seriously, will tell you the GT4 RS is actually more enjoyable.
Australian Pricing
The GT4 RS launched in Australia at approximately $350,000 to $360,000 before options. The Weissach package, available here, adds magnesium wheels, a front axle lift system, carbon-fibre elements, and various weight reductions for roughly $25,000 to $30,000 above the base price. Fully optioned cars can approach $420,000, and LCT applies aggressively at these prices.
Used examples are now available in the Australian market as the first wave of buyers have sold. Early examples with low kilometres are holding value firmly, and cars in good condition with service records are trading in the $320,000 to $380,000 range depending on spec and colour. Allocation was extremely tight when the car launched, and Porsche Centre waiting lists were long. If you are looking at a used GT4 RS today, confirming the compliance history and whether it has Australian-market warranty remaining is straightforward but worth doing properly.
PDK Only – and Why That Is Fine
The GT4 RS is PDK only. There is no manual option. When this was announced, some in the enthusiast community objected – the preceding GT4 was available with a six-speed manual, and Porsche had a tradition of offering the manual as the more driver-focused choice. The GT4 RS is the most focused version of the car Porsche makes. Should it not have a manual?
The honest answer is no. The PDK gearbox changes gear in roughly 80 milliseconds, which is faster than any human can manage. At 9,000rpm, where you need the shifts to happen, the PDK changes gear at the right moment with the right engine speed every time. A manual in this car would slow lap times, introduce driver error, and require a very specific skill set. Porsche made the right call. The character of the car comes from the engine and the chassis, not from the gearchange action, and the PDK does nothing to diminish that character.
GT3 RS or GT4 RS
This is genuinely a difficult question, and the answer depends on what you are doing with the car. The GT3 RS is faster on circuit. It has more downforce, more power, and more sophisticated aerodynamics. It is also $250,000 more expensive at current Australian pricing, heavier, louder on the road, and requires a different commitment to use properly.
The GT4 RS is the car you can drive more frequently without it demanding every bit of your attention. It is still a serious track tool, but it is also a car you could take to a Sunday morning drive in the hills and come back feeling entertained rather than exhausted. The smaller, lighter body makes it quicker in tighter technical sections even if the GT3 RS eventually pulls ahead where the track opens up.
For most buyers who will use their car on a mix of track days and good roads, the GT4 RS is the more compelling choice. That is a sentence that would have been almost impossible to write before this car existed.