Porsche 718 Cayman GT4 RS vs Porsche 911 GT3
Compare the Porsche 718 Cayman GT4 RS vs Porsche 911 GT3. The Porsche 718 Cayman GT4 RS is £35,000 cheaper. The Porsche 911 GT3 is 0.0s quicker to 60mph. The Porsche 911 GT3 is more fuel efficient. Full performance, cost & ownership breakdown.
The Porsche 718 Cayman GT4 RS is priced from £115,000, powered by a 4.0L Flat-6, producing 493 hp, with 450 Nm of torque, reaching 0-62 mph in 3.4 s, a top speed of 196 mph, sent to the road via rear-wheel drive. The Porsche 911 GT3 is priced from £143,000, powered by a 4.0L Flat-6, producing 502 hp, with 470 Nm of torque, reaching 0-62 mph in 3.4 s, a top speed of 198 mph, sent to the road via rear-wheel drive.
The Porsche 718 Cayman GT4 RS offers a 125-litre boot, a usable front boot, runs on petrol, returns around 21.4 mpg (WLTP combined), is covered by a 3 years / unlimited miles (original UK new-car cover) warranty. The Porsche 911 GT3 offers a 132-litre boot, a usable front boot, runs on petrol, returns around 23 mpg, is covered by a 3 years / unlimited miles (original UK new-car cover) warranty.
On cost of ownership, the Porsche 718 Cayman GT4 RS is £35,000 cheaper than its rival, the Porsche 718 Cayman GT4 RS costs less in annual maintenance (£1,300 versus £1,500), the Porsche 911 GT3 is the more fuel-efficient choice, the Porsche 911 GT3 has 64 L fuel tank.
Driving Character: Porsche 718 Cayman GT4 RS vs Porsche 911 GT3
The Porsche 718 Cayman GT4 RS represents the apex of the 718 platform, transplanting a 493hp naturally aspirated flat-six from the GT3 into a mid-engine chassis. The result is a machine with staggering agility and a turn-in response that makes even the standard GT4 feel soft. The chassis balance is dominated by rear-end grip and sharp, responsive steering that provides constant feedback. It is an extreme instrument, demanding a high level of expertise to truly extract its full potential. The power delivery is frenetic, culminating in a high-revving wail that defines the car's racing-inspired character.
The Porsche 911 GT3 remains the benchmark for naturally aspirated sports cars. Its 4.0L flat-six is a masterpiece of linear power delivery, revving to a crescendo that defines the driving experience. The chassis balance is near perfect, thanks to its sophisticated double-wishbone front suspension, which provides telepathic steering feedback. On the road, it is a demanding partner that requires focus, yet it rewards the driver with an analogue feel that is largely absent from its turbocharged peers. Every gearshift, whether manual or PDK, is crisp and intentional, cementing its position as a true driver-focused machine for the real world.
Head-to-head, the division is clear: the Porsche 718 Cayman GT4 RS — High-revving 4.0L flat-six; mid-engine platform provides superior agility compared to rear-engined counterparts; the Porsche 911 GT3 — Naturally aspirated 4.0L flat-six; linear, rev-hungry throttle response. Characteristic of the Porsche 718 Cayman GT4 RS: Induction noise proximity; intake plenums directly behind occupants intensify the driving experience. For the Porsche 911 GT3: Communicative steering with genuine road feel; analogue at the limit. In outright terms it is 493 hp against 502 — a 9 hp gap — and the Porsche 911 GT3 reaches 60 mph 0.0s sooner.
Interior & Cabin: Porsche 718 Cayman GT4 RS vs Porsche 911 GT3
The interior is a study in weight reduction, featuring CFRP door panels, lightweight door pulls, and carbon bucket seats that lock the driver in place. The presence of the standard roll bar behind the seats signals its intent, creating a sparse, motorsport-focused atmosphere. Sound deadening is intentionally minimal, allowing the mechanical symphony—and the roar of the intake located just behind the driver's head—to flood the cabin. It is not designed for luxury or comfort, but rather as an extension of the driving experience, prioritising tactical feedback and material efficiency above all else.
The cabin of the Porsche 911 GT3 is a focused environment, blending high-end technology with a driver-centric design. Alcantara and carbon fibre trim are standard, providing a tactile, high-quality feel that mirrors the car’s track-ready intention. The instrumentation is clear and uncluttered, ensuring that vital information is at the driver's fingertips. While the rear seats are removed to save weight, the front interior remains comfortable enough for a spirited drive across continents. The ergonomics are peerless, placing every control in the perfect position for intuitive use during high-speed operation, reflecting the deep thought Porsche invests in its driver interface.
Head-to-head, the division is clear: the Porsche 718 Cayman GT4 RS — Lightweight door pull designs; carbon fibre trim reinforces the purpose-built racing architecture; the Porsche 911 GT3 — Driver-focused ergonomics; clear, purposeful instrumentation. Characteristic of the Porsche 718 Cayman GT4 RS: Fixed-back bucket seats; cabin layout restricts movement to ensure ideal driving posture. For the Porsche 911 GT3: Alcantara and carbon trim; stripped-back but quality materials.
Daily Usability: Porsche 718 Cayman GT4 RS vs Porsche 911 GT3
Daily utility is significantly compromised by the track-oriented nature of the GT4 RS. The suspension is exceptionally firm, making it punishing on all but the smoothest road surfaces, and the lack of sound insulation makes it unsuitable for long, tedious commutes. Despite this, the front and rear trunks remain available for storage, and the inclusion of a front-axle lift system helps navigate urban obstacles. While it is technically possible to drive to the track, the RS experience is best reserved for spirited road use or dedicated circuit days rather than routine errands.
Despite its hardcore reputation, the Porsche 911 GT3 is surprisingly usable for an enthusiast. The dimensions are well-suited to narrow UK lanes, and the front lift system helps preserve the front bumper over speed humps. While the suspension is undeniably firm, it is well-damped, avoiding the harshness found in more extreme models. Luggage capacity is sufficient for a weekend of touring, with both the front and rear shelf area providing storage. It functions well for urban errands, though the engine’s performance is clearly happiest when given the space to stretch its legs on a challenging back road.
Head-to-head, the division is clear: the Porsche 718 Cayman GT4 RS — Balanced mid-engine weight distribution; 125L boot space accommodates smaller luggage bags; the Porsche 911 GT3 — Manageable dimensions suit urban environments better than rivals. Characteristic of the Porsche 718 Cayman GT4 RS: 110 mm ground clearance aids accessibility; compact 4379 mm length eases urban maneuvering. For the Porsche 911 GT3: Front trunk and rear boot usable for weekend luggage. that means 125 litres of boot space against 132, and everyday running costs that favour the Porsche 911 GT3 at the pumps.
Ownership: Porsche 718 Cayman GT4 RS vs Porsche 911 GT3
Owning a 718 Cayman GT4 RS is a high-stakes proposition, with high purchase prices and significant service costs reflecting its status as a low-volume, specialised performance vehicle. Values have appreciated rapidly, as the model occupies a unique space in the modern Porsche lineup. Owners benefit from the comprehensive Porsche Motorsport support network, which is essential for managing RS-specific components that are more expensive and harder to source than standard parts. It is a collector's dream, provided the owner acknowledges the substantial overheads and the demanding nature of maintaining a high-performance track machine.
Ownership of the Porsche 911 GT3 is a relatively straightforward affair within the performance car market. The extensive Porsche dealer network provides excellent service coverage, making it easier to maintain than hypercar-level alternatives. Residual values remain exceptionally strong, with demand consistently outstripping supply. Annual maintenance costs are reflective of the performance specification, but parts availability is good. Insurance is manageable for a car of this capability, and the reliability of the naturally aspirated powertrain adds a layer of confidence to the ownership experience. It is a car that makes financial and emotional sense to the dedicated enthusiast.
Head-to-head, the division is clear: the Porsche 718 Cayman GT4 RS — Strong brand reputation; dealer service intervals are predictable for the mid-engine platform; the Porsche 911 GT3 — Porsche dealer network extensive; service expertise widely available. Characteristic of the Porsche 718 Cayman GT4 RS: High resale demand; specialized Porsche engineering creates long-term value for automotive enthusiasts. For the Porsche 911 GT3: Exceptional residuals; high enthusiast demand sustains value. On the wallet the two diverge at £115,000 versus £143,000 — a £28,000 difference, with annual maintenance of £1,300 against £1,500.