You’ll be very unlikely to find much of this out on the open road, the mix of prodigious roadholding and law-smashing performance ensuring that. But on the right road, either of these machines is pretty exhilarating, not least for the engine’s suitably combustive soundtrack in sport. You also get the fundamental convenience and practicality of the standard X3 and X4, though the latter is less commodious with its sloping roofline.
Neither car is cheap, but if you have the budget a more off-putting deterrent will be the wincing ride quality of this pair, which is nowhere near good enough for Britain’s turbulent roads. Despite the excellence of that new engine, it makes them hard to recommend.
Stat attack: BMW X3 M Competition
Price: £77,190
Powertrain: 3.0-litre twin-turbo six-cylinder petrol
Transmission: eight-speed automatic, all-wheel-drive
Power/torque: 503bhp @ 5,950-7,200rpm/600Nm (443lb ft) @ 2,600-5,950rpm
0-62mph: 4.1 seconds
Top speed: 177mph (delimited)
Kerb weight: 1,970kg
Stat attack: BMW X4 M Competition
Price: £80,110
Powertrain: 3.0-litre twin-turbo six-cylinder petrol
Transmission: eight-speed automatic, all-wheel-drive
Power/torque: 503bhp @ 5,950-7,200rpm/600Nm (443lb ft) @ 2,600-5,950rpm
0-62mph: 4.1 seconds
Top speed: 177mph (delimited)
Kerb weight: 1,970kg