Performance, power and 0-100 km/h
2024 Porsche 718 Boxster GTS 4.0 has the quicker recorded 0-100 km/h time at 4.0 seconds, compared with 4.1 seconds for 2025 BMW Z4 M40i. 2024 Porsche 718 Boxster GTS 4.0 has the higher listed output at 400 hp; 2025 BMW Z4 M40i is rated at 382 hp, a difference of 18 hp. The torque figures follow 2025 BMW Z4 M40i at 500 Nm and 2024 Porsche 718 Boxster GTS 4.0 at 420 Nm. These figures describe straight-line potential only; they do not establish braking performance, ride quality, steering response or durability under repeated hard use.
Range, battery, charging and efficiency
2025 BMW Z4 M40i has the lower recorded consumption at 8.9 L/100km; 2024 Porsche 718 Boxster GTS 4.0 is listed at 10.0 L/100km. Test cycle, temperature, wheel size and charging conditions can materially affect these results, so only figures measured on the same basis should be treated as directly comparable.
Dimensions, cargo space and towing
2025 BMW Z4 M40i provides the larger quoted cargo volume: 281 litres versus 150 litres, a difference of 131 litres. 2024 Porsche 718 Boxster GTS 4.0 is 67 mm longer overall. Exterior size is not a benefit by itself: a longer body may create useful room, but cargo shape, rear-seat space and ease of parking still require a physical inspection.
Price and overall assessment
2025 BMW Z4 M40i has the lower listed starting price at $65,500, compared with $91,700 for 2024 Porsche 718 Boxster GTS 4.0. The measured categories split evenly, so the better choice depends on which attributes matter most. The assessment is based on the specifications shown here; it is not presented as a two-car road test.