Porsche 911 Targa 4 GTS vs Mercedes-AMG SL 63

Compare the Porsche 911 Targa 4 GTS vs Mercedes-AMG SL 63. The Porsche 911 Targa 4 GTS is £20,000 cheaper. The Porsche 911 Targa 4 GTS is 0.5s quicker to 60mph. The Porsche 911 Targa 4 GTS is more fuel efficient. Full performance, cost & ownership breakdown.

The Porsche 911 Targa 4 GTS is priced from £145,000, powered by a 3.6L e-turbo flat-six T-Hybrid, producing 534 hp, with 610 Nm of torque, reaching 0-62 mph in 3.1 s, a top speed of 194 mph, sent to the road via all-wheel drive. The Mercedes-AMG SL 63 is priced from £165,000, powered by a 4.0L Twin-Turbo V8, producing 577 hp, with 800 Nm of torque, reaching 0-62 mph in 3.6 s, a top speed of 196 mph, sent to the road via all-wheel drive.

The Porsche 911 Targa 4 GTS offers a 135-litre boot, a usable front boot, runs on petrol, returns around 26 mpg, is covered by a 3 years / unlimited miles (original UK new-car cover) warranty. The Mercedes-AMG SL 63 offers a 213-litre boot, runs on petrol, returns around 21.9 mpg (WLTP combined), is covered by a 3 years / unlimited miles (original UK new-car cover) warranty.

On cost of ownership, the Porsche 911 Targa 4 GTS is £20,000 cheaper than its rival, both require around £1,500 per year in maintenance, the Porsche 911 Targa 4 GTS is the more fuel-efficient choice, the Porsche 911 Targa 4 GTS has 63 L fuel tank, the Mercedes-AMG SL 63 has 70 L fuel tank.

Driving Character: Porsche 911 Targa 4 GTS vs Mercedes-AMG SL 63

The 992.2 Targa 4 GTS uses a 3.6-litre flat-six with an electrically assisted exhaust turbocharger and an electric motor integrated into the eight-speed PDK. The combustion engine supplies 357 kW and 570 Nm; combined system output is 398 kW and 610 Nm. All-wheel drive, rear-axle steering and PASM form part of the published chassis specification.

The Mercedes-AMG SL 63 transitions the lineage toward a sophisticated grand tourer profile, prioritising compliance over the surgical precision of its predecessor. The 4.0-litre twin-turbo V8 delivers a relentless surge of torque, managed by an all-wheel-drive system that ensures composure in challenging UK conditions. While the AMG Active Ride Control suspension offers remarkable poise for a heavy convertible, the steering feel remains somewhat insulated compared to pure sports cars. It excels as a high-speed cruiser rather than a track-day weapon, favouring long-distance refinement and effortless pace over the frantic, razor-sharp feedback once associated with the AMG brand.

Head-to-head, the division is clear: the Porsche 911 Targa 4 GTS — The 992.2 Targa 4 GTS combines a 3.6-litre electrically turbocharged flat-six with T-Hybrid assistance and all-wheel drive.; the Mercedes-AMG SL 63 — SL 63 AWD with active rear steering; more dynamic than SL predecessors. Characteristic of the Porsche 911 Targa 4 GTS: Targa roof mechanism; chassis rigidity remains high despite the open-top architectural change. For the Mercedes-AMG SL 63: 577hp V8 with characteristic AMG torque delivery across the rev range. In outright terms it is 534 hp against 577 — a 43 hp gap — and the Porsche 911 Targa 4 GTS reaches 60 mph 0.5s sooner.

Interior & Cabin: Porsche 911 Targa 4 GTS vs Mercedes-AMG SL 63

The cabin of the Porsche 911 Targa 4 GTS is dominated by the iconic Targa bar, which provides a unique open-air experience while maintaining structural integrity. The interior is finished to a high standard, with premium materials and the intuitive, driver-centric layout that characterises the 992 generation. While the Targa bar creates a stylish aesthetic, it does restrict rear visibility somewhat. The technology, including the standard Bose audio, is well-integrated and provides a modern feel. It is a sophisticated, high-quality environment that balances luxury with the functional needs of a performance-oriented driver.

Inside, the SL 63 feels thoroughly modern, dominated by a portrait-oriented MUX interface that dictates the cabin aesthetic. The digital cockpit is crisp, though the heavy reliance on touch-sensitive surfaces can feel counterintuitive when pressing on. Material quality is excellent, with high-grade leathers and metals, yet the ergonomics are compromised by the vestigial rear seats, which serve more as shelf space than viable seating. It lacks the intimate, driver-focused cocoon of the previous AMG GT, opting instead for a broad, open-air cockpit design that prioritises perceived luxury and connectivity over raw, tactile immersion.

Head-to-head, the division is clear: the Porsche 911 Targa 4 GTS — Luxury ergonomics; tech-focused cabin environment balances modern comfort with driver engagement features; the Mercedes-AMG SL 63 — Soft-top roadster with genuine 2+2 rear seats returned to SL range. Characteristic of the Porsche 911 Targa 4 GTS: High-quality leather and trim; interior refinement provides a quiet environment when closed. For the Mercedes-AMG SL 63: MBUX Hyperscreen available; most technology-forward SL interior ever.

Daily Usability: Porsche 911 Targa 4 GTS vs Mercedes-AMG SL 63

Practicality is a major strength of the Porsche 911 Targa 4 GTS, as it offers the security of all-wheel drive and the joy of an open top. This combination makes it a genuinely usable car for all seasons, functioning perfectly as a daily driver. The rear seats offer occasional space for children or extra storage, and the front trunk is surprisingly capacious. While the roof mechanism does impact boot space when fully retracted, the overall design remains very user-friendly. It is a refined, comfortable cruiser that does not sacrifice its sporty character in the pursuit of daily usability.

Daily utility is remarkably improved, largely due to the transition to a fully variable fabric roof that saves significant boot space and lowers the centre of gravity. The 213-litre capacity remains tight, though it accommodates soft luggage better than the old hard-top systems. Parking remains a chore; the wide, low-slung bodywork requires cautious navigation through tight urban gaps, and the extensive bonnet length demands foresight. Nevertheless, the sophisticated suspension tuning allows it to soak up poorly maintained road surfaces with grace, making it a viable, albeit thirsty, companion for regular motorway commutes and long-distance touring.

Head-to-head, the division is clear: the Porsche 911 Targa 4 GTS — The manufacturer technical sheet lists 135 litres of front luggage volume; rear stowage is a separate figure.; the Mercedes-AMG SL 63 — Roof mechanism reliable and rapid; usable as open-top grand tourer. Characteristic of the Porsche 911 Targa 4 GTS: 110 mm clearance ensures daily usability; ride quality absorbs common road imperfections well. For the Mercedes-AMG SL 63: AWD enables year-round use in all climates; better versatility than predecessors. that means 135 litres of boot space against 213, plus a usable front boot in the Porsche 911 Targa 4 GTS, and everyday running costs that favour the Porsche 911 Targa 4 GTS at the pumps.

Ownership: Porsche 911 Targa 4 GTS vs Mercedes-AMG SL 63

The 992.2 Targa 4 GTS combines the Targa roof system with the newer T-Hybrid powertrain. Service requirements must be checked against the exact model year and market. Its electric turbocharger and transmission-integrated motor distinguish its servicing needs from the earlier GTS. Warranty and repair costs depend on the applicable contract, vehicle history and market.

Ownership is bolstered by the vast, well-integrated Mercedes-Benz dealer network, which provides consistent support for the complex AMG powertrain. Maintenance costs are steep, with annual services reflecting the performance-oriented nature of the twin-turbo V8, and the intricate soft-top mechanism introduces a long-term servicing variable that owners must anticipate. While depreciation is generally mitigated by the enduring prestige of the SL moniker, the market is competitive. Reliability is generally predictable, provided the rigid servicing intervals are respected, ensuring the complex electronics and drivetrain remain within optimal operating parameters throughout the ownership period.

Head-to-head, the division is clear: the Porsche 911 Targa 4 GTS — Reliable Porsche drivetrain; servicing is supported by a comprehensive dealer network infrastructure; the Mercedes-AMG SL 63 — Mercedes SL has decades of reliability history; latest generation expected to continue. Characteristic of the Porsche 911 Targa 4 GTS: Strong resale market; combination of Targa style and GTS performance maintains desirability. For the Mercedes-AMG SL 63: Broad dealer network and long-running support programmes. On the wallet the two diverge at £145,000 versus £165,000 — a £20,000 difference.

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