BMW M4 CSL vs Porsche 718 Cayman GT4
Compare the BMW M4 CSL vs Porsche 718 Cayman GT4. The BMW M4 CSL is £3,315 cheaper. The BMW M4 CSL is 0.6s quicker to 60mph. The Porsche 718 Cayman GT4 is more fuel efficient. Full performance, cost & ownership breakdown.
The BMW M4 CSL is priced from £74,685, powered by a 3.0L Twin-Turbo I6, producing 543 hp, with 650 Nm of torque, reaching 0-60 mph in 3.6s, a top speed of 191 mph, sent to the road via rear-wheel drive. The Porsche 718 Cayman GT4 is priced from £84,000, powered by a 4.0L Flat-6, producing 414 hp, with 420 Nm of torque, reaching 0-60 mph in 4.2s, a top speed of 188 mph, sent to the road via rear-wheel drive.
The BMW M4 CSL offers a 440-litre boot, runs on petrol, returns around 25 mpg, is covered by a 3yr / unlimited mi warranty. The Porsche 718 Cayman GT4 offers a 150-litre boot, a usable front boot, runs on petrol, returns around 25 mpg, is covered by a 4yr / 50k mi warranty.
On cost of ownership, the BMW M4 CSL is £3,315 cheaper than its rival, the Porsche 718 Cayman GT4 costs less in annual maintenance (£1,300 versus £1,100), a full tank costs around £75 for the BMW M4 CSL and £70 for the Porsche 718 Cayman GT4.
Driving Character: BMW M4 CSL vs Porsche 718 Cayman GT4
The M4 CSL represents the pinnacle of track-focused engineering for the current generation. Stripped of weight and tuned for maximum response, the chassis feels sharper and more visceral than any standard Competition model. With 543 horsepower routed solely to the rear wheels, traction management is critical, requiring a precise, disciplined approach from the driver. The steering is arguably the most communicative in the M-lineup, providing immediate feedback from the front tyres. It is a car built for circuit performance, with stiff springs and aggressive dampers that prioritise lap times and sustained performance over road-going compliance.
The Porsche 718 Cayman GT4 is the definition of chassis purity, pairing a naturally aspirated 4.0-litre flat-six with a mid-engine layout that offers near-perfect neutrality. The 414hp delivery is linear and predictable, allowing for precise throttle modulation through technical sections of track. The manual gearbox is a highlight, featuring short, mechanical throws that engage the driver completely. While it lacks the raw top-end speed of 911-based variants, the balanced chassis and communicative steering allow it to carry immense cornering speed, making it an exceptionally rewarding tool for those who value driver input over outright power figures.
Head-to-head, the division is clear: the Porsche 718 Cayman GT4 takes our 0-100 driving character grading, 92 against 93. Characteristic of the BMW M4 CSL: Track-focused, lightweight M4 with the sharpest chassis in the range. For the Porsche 718 Cayman GT4: Purist mid-engined chassis balance and involvement. In outright terms it is 543 hp against 414 — a 129 hp gap — and the BMW M4 CSL reaches 60 mph 0.6s sooner.
Interior & Cabin: BMW M4 CSL vs Porsche 718 Cayman GT4
The interior is a stark, focused environment designed to minimise distractions and shed weight. Carbon bucket seats are standard, offering uncompromising support, though they can be difficult to climb in and out of. Much of the typical luxury trim has been removed in favour of lightweight materials and exposed components. The dashboard still features the high-resolution curved display, ensuring the driver has access to telemetry and performance data at a glance. Legroom in the rear is minimal, effectively treating the rear bench as a shelf for track gear rather than a place for passengers.
The cabin prioritises function, stripping away unnecessary luxuries in favour of an Alcantara-lined environment that feels race-ready. The Sport Seats Plus provide excellent lateral support during spirited driving, while the minimalist dashboard design ensures the focus remains entirely on the road ahead. Given its track-focused intent, the cabin storage is sparse and the rear seating area is replaced by a structural strut brace. It is a clean, purposeful space, though some may find the lack of comfort-oriented features a challenge for long-distance touring, fitting perfectly with the model's lightweight, enthusiast-oriented persona.
Head-to-head, the division is clear: the BMW M4 CSL takes our 0-100 interior & cabin grading, 58 against 55. Characteristic of the BMW M4 CSL: Motorsport bucket seats and minimal trim, focused on weight-saving. For the Porsche 718 Cayman GT4: Motorsport-flavoured cabin with genuine everyday livability.
Daily Usability: BMW M4 CSL vs Porsche 718 Cayman GT4
Daily utility is not the primary objective of the M4 CSL, and it shows. The low ride height and stiff suspension make navigating urban speed bumps or steep driveways a chore. While the 440-litre boot is identical to other M4 models, the lack of rear-seat utility limits its effectiveness as a family car. It is, however, perfectly capable of handling occasional motorway trips, though cabin noise from the lack of sound deadening is noticeable. For those who want a track-weapon that can legally drive to the circuit, it offers unmatched engagement, provided the compromises are accepted.
Utility is a standout feature, as the combination of front and rear trunks allows for surprising storage capacity, making the GT4 a versatile choice for weekend touring. Its compact dimensions make it relatively easy to navigate through tight city streets, although the low front splitter demands care over speed bumps and steep inclines. The suspension is firm, bordering on harsh for daily use in Sport mode, though it remains composed enough for the committed driver. It manages to balance track-ready performance with sufficient real-world practicality, provided the owner is prepared for a more rigorous ride quality.
Head-to-head, the division is clear: the Porsche 718 Cayman GT4 takes our 0-100 daily usability grading, 45 against 68. Characteristic of the BMW M4 CSL: Usable but clearly built for track days over commuting. For the Porsche 718 Cayman GT4: Surprisingly civil ride and quiet cabin for a track-focused car. that means 440 litres of boot space against 150, plus a usable front boot in the Porsche 718 Cayman GT4.
Ownership: BMW M4 CSL vs Porsche 718 Cayman GT4
Maintenance for the CSL is a premium affair, with high-performance components specifically designed for track wear. Residual values are bolstered by its limited-edition status, making it a sound long-term investment for collectors. Standard BMW servicing applies, but parts unique to the CSL, such as specific brake and chassis components, are significantly more expensive than standard M4 parts. Insurance is also likely to be higher, reflecting the performance potential and the scarcity of body panels. It is a car for the committed enthusiast who values exclusivity and track capability above all else.
Porsche ownership provides a reliable and extensive dealer network, ensuring that the Cayman GT4 is well-supported throughout its life. As a naturally aspirated model, the GT4 has retained significant residual value, making it a sound financial proposition for enthusiasts. Servicing intervals are well-defined, and while specific GT4 components might require longer lead times, the mechanical robustness of the 4.0-litre engine offers peace of mind. It remains a model with a dedicated community and strong factory support, ensuring that this iteration of the Cayman will remain a coveted machine for years to come.
Head-to-head, the division is clear: the Porsche 718 Cayman GT4 takes our 0-100 ownership grading, 72 against 78. Characteristic of the BMW M4 CSL: Limited-run status keeps strong collector demand. For the Porsche 718 Cayman GT4: Mechanically simple, Porsche-grade reliability. On the wallet the two diverge at £74,685 versus £84,000 — a £9,315 difference, with annual maintenance of £1,300 against £1,100, and warranty cover of 3yr / unlimited mi versus 4yr / 50k mi.