Porsche 718 Cayman GT4 RS vs BMW M3 Touring
Compare the Porsche 718 Cayman GT4 RS vs BMW M3 Touring. The BMW M3 Touring is £23,000 cheaper. The Porsche 718 Cayman GT4 RS is 0.2s quicker to 60mph. The BMW M3 Touring 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 0-60 mph in 3.4s, a top speed of 196 mph, sent to the road via rear-wheel drive. The BMW M3 Touring is priced from £85,000, powered by a 3.0L Twin-Turbo I6, producing 503 hp, with 650 Nm of torque, reaching 0-60 mph in 3.6s, a top speed of 180 mph, sent to the road via all-wheel drive.
The Porsche 718 Cayman GT4 RS offers a 125-litre boot, a usable front boot, runs on petrol, returns around 23 mpg, is covered by a 4yr / 50k mi warranty. The BMW M3 Touring offers a 500-litre boot, folding rear seats, runs on petrol, returns around 26 mpg, is covered by a 3yr / unlimited mi warranty.
On cost of ownership, the BMW M3 Touring is £23,000 cheaper than its rival, the BMW M3 Touring costs less in annual maintenance (£1,300 versus £1,200), the BMW M3 Touring is the more fuel-efficient choice, a full tank costs around £70 for the Porsche 718 Cayman GT4 RS and £75 for the BMW M3 Touring.
Driving Character: Porsche 718 Cayman GT4 RS vs BMW M3 Touring
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 M3 Touring masterfully combines S58-powered fury with practical estate packaging. Its AWD system, featuring a dedicated 2WD mode, allows it to put down its immense 650Nm of torque with relentless efficiency in any weather. Despite weighing over 4,000 lbs, the chassis control is immense, with adaptive damping that keeps body roll impressively contained. The steering is quick and accurate, though it prioritises stability at high speeds over the fine-grained feedback of lighter machines. It is arguably the most versatile performance vehicle in the current market, bridging the gap between a family hauler and a track-ready super-saloon.
Head-to-head, the division is clear: the Porsche 718 Cayman GT4 RS takes our 0-100 driving character grading, 96 against 82. Characteristic of the Porsche 718 Cayman GT4 RS: GT3-derived engine in the lightest, most track-focused Cayman ever. For the BMW M3 Touring: The M3's engagement in a genuinely practical estate body. In outright terms it is 493 hp against 503 — a 10 hp gap — and the Porsche 718 Cayman GT4 RS reaches 60 mph 0.2s sooner.
Interior & Cabin: Porsche 718 Cayman GT4 RS vs BMW M3 Touring
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.
Inside, the cabin is dominated by a modern, tech-rich dashboard that includes the impressive curved display interface. While the interior is packed with high-end carbon fibre and robust leather, some buttons and plastics feel inherited from the standard 3-Series, which may underwhelm at this price point. The M-specific seats are supportive and offer excellent adjustability for long journeys. Space is the defining trait, with a generous rear seat providing genuine comfort for adults, complemented by a versatile, user-friendly load area that expands into a cavernous 1,510 litres with the seats folded down.
Head-to-head, the division is clear: the BMW M3 Touring takes our 0-100 interior & cabin grading, 50 against 82. Characteristic of the Porsche 718 Cayman GT4 RS: Stripped-back, motorsport-focused cockpit. For the BMW M3 Touring: Spacious, well-finished cabin with proper 4-adult seating.
Daily Usability: Porsche 718 Cayman GT4 RS vs BMW M3 Touring
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.
This is a remarkably practical performance car, boasting a 500-litre boot that easily swallows bulky cargo, making the school run or holiday trips effortless. The inclusion of M xDrive provides the confidence to use the car year-round, regardless of road conditions. In Comfort mode, the suspension is compliant enough to mask its heavy weight, although the low-profile tyres can still transmit significant impact shocks from sharp potholes. Parking requires extra care due to the extended estate body, but the rear-view cameras and sensors mitigate the challenges of manoeuvring such a long, wide vehicle in confined spaces.
Head-to-head, the division is clear: the BMW M3 Touring takes our 0-100 daily usability grading, 35 against 90. Characteristic of the Porsche 718 Cayman GT4 RS: Usable but clearly built for track days over commuting. For the BMW M3 Touring: Genuinely does everything - family estate space with supercar-baiting pace. that means 125 litres of boot space against 500, plus a usable front boot in the Porsche 718 Cayman GT4 RS, and everyday running costs that favour the BMW M3 Touring at the pumps.
Ownership: Porsche 718 Cayman GT4 RS vs BMW M3 Touring
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.
As the first factory-produced M3 estate, this model enjoys exceptionally strong residual values and high demand from enthusiasts. The service network is extensive, and standard BMW warranty terms provide peace of mind for the first three years. Maintenance costs are higher than standard models, especially when considering the rapid wear on high-performance tyres and the complex braking systems. However, the prestige and versatility of the package make these costs easier to justify. It is a car that thrives on daily use, provided the owner is prepared for the inevitable premium associated with running an elite performance machine.
Head-to-head, the division is clear: the Porsche 718 Cayman GT4 RS takes our 0-100 ownership grading, 78 against 76. Characteristic of the Porsche 718 Cayman GT4 RS: Mechanically simple, Porsche-grade reliability. For the BMW M3 Touring: Backed by strong BMW ownership/reliability reputation. On the wallet the two diverge at £115,000 versus £85,000 — a £30,000 difference, with annual maintenance of £1,300 against £1,200, and warranty cover of 4yr / 50k mi versus 3yr / unlimited mi.