BMW M4 CSL vs Porsche 718 Spyder RS
Compare the BMW M4 CSL vs Porsche 718 Spyder RS. The BMW M4 CSL is £55,315 cheaper. The Porsche 718 Spyder RS is 0.2s quicker to 60mph. The BMW M4 CSL 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 Spyder RS is priced from £140,000, 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 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 Spyder 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.
On cost of ownership, the BMW M4 CSL is £55,315 cheaper than its rival, the BMW M4 CSL costs less in annual maintenance (£1,300 versus £1,400), the BMW M4 CSL is the more fuel-efficient choice, a full tank costs around £75 for the BMW M4 CSL and £70 for the Porsche 718 Spyder RS.
Driving Character: BMW M4 CSL vs Porsche 718 Spyder RS
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 Spyder RS is defined by its mid-engine configuration and the installation of the 4.0L flat-six from the GT3. The chassis is a masterpiece of precision, featuring RS-specific suspension geometry that rewards technical accuracy. The steering feel is sharp and communicative, offering a visceral connection to the tarmac that few modern roadsters can replicate. While it is certainly capable on a track, the engine note and open-top architecture make it a raw experience on winding B-roads. The gearshifts are lightning fast, ensuring the powertrain remains at the heart of the driving sensation throughout every spirited corner.
Head-to-head, the division is clear: the Porsche 718 Spyder RS takes our 0-100 driving character grading, 92 against 94. Characteristic of the BMW M4 CSL: Track-focused, lightweight M4 with the sharpest chassis in the range. For the Porsche 718 Spyder RS: GT4 RS power in an open-top body - visceral and track-honed. In outright terms it is 543 hp against 493 — a 50 hp gap — and the Porsche 718 Spyder RS reaches 60 mph 0.2s sooner.
Interior & Cabin: BMW M4 CSL vs Porsche 718 Spyder RS
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.
Inside, the Porsche 718 Spyder RS prioritises weight saving over luxury. The carbon fibre bucket seats provide immense support, while the use of fabric door pulls and minimal sound insulation highlights its motorsport heritage. Build quality is characteristically high, though the cabin environment is undeniably sparse compared to a standard 718. The infotainment system is functional rather than flashy, providing necessary data without distracting from the task of driving. Despite the lack of plush padding, the driver-focused ergonomics remain impeccable, creating a purposeful space that reflects the uncompromising nature of the vehicle’s design philosophy.
Head-to-head, the division is clear: the BMW M4 CSL takes our 0-100 interior & cabin grading, 58 against 52. Characteristic of the BMW M4 CSL: Motorsport bucket seats and minimal trim, focused on weight-saving. For the Porsche 718 Spyder RS: Stripped-back, motorsport-focused cockpit.
Daily Usability: BMW M4 CSL vs Porsche 718 Spyder RS
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.
Daily utility is clearly secondary to performance in the Porsche 718 Spyder RS, yet it remains surprisingly manageable. The inclusion of a nose lift system as standard allows for navigation over urban speed bumps and steep inclines without damaging the front splitter. Storage is adequate for a weekend getaway, with both a front boot and a rear luggage compartment available for essential items. Ingress and egress require some physical agility due to the low-slung bucket seats and side sills, but for owners who accept the compromise of a manual roof operation, it serves as a usable roadster.
Head-to-head, the division is clear: the BMW M4 CSL takes our 0-100 daily usability grading, 45 against 38. Characteristic of the BMW M4 CSL: Usable but clearly built for track days over commuting. For the Porsche 718 Spyder RS: Usable but clearly built for spirited driving over commuting. that means 440 litres of boot space against 125, plus a usable front boot in the Porsche 718 Spyder RS, and everyday running costs that favour the BMW M4 CSL at the pumps.
Ownership: BMW M4 CSL vs Porsche 718 Spyder RS
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.
Ownership of the Porsche 718 Spyder RS is defined by its exclusivity and potential for appreciation. As a model with limited production, it sits in a secure position within the enthusiast market. While annual maintenance costs are high, the support provided by the Porsche Motorsport division offers peace of mind for specialized mechanical needs. Insurance premiums will be substantial, and the high purchase price requires careful consideration, but the prospect of long-term residual strength remains strong. For collectors and enthusiasts alike, it represents a peak of internal combustion performance within the Porsche stable.
Head-to-head, the division is clear: the Porsche 718 Spyder RS 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 Spyder RS: Mechanically simple, Porsche-grade reliability. On the wallet the two diverge at £74,685 versus £140,000 — a £65,315 difference, with annual maintenance of £1,300 against £1,400, and warranty cover of 3yr / unlimited mi versus 4yr / 50k mi.