It offers a huge surge of initial performance - enough to haul the not-insubstantial XD3 to 62mph in 4.9sec, claims Alpina - but is equally happy to be revved out beyond 4000rpm as you nudge towards a top speed of 157mph. It’ll even give you a pleasing exhaust note while it does it - no mean feat for a turbodiesel. Oh, and did we mention the CO2 emissions are 174g/km? Real-world economy of 35mpg should be more than achievable.
Alpina has worked with supplier ZF on remapping and reconfiguring BMW’s regular eight-speed automatic transmission. The result is an intelligent gearbox that shifts extremely quickly and smoothly. You can operate it in manual mode (via buttons stitched into the back of the wheel; another Alpina curiosity) and should you do so, you’ll find the XD3 delivering a rare amount of involvement and enjoyment for an SUV.
That’s because while the chassis set-up has been retuned for this facelift to provide extra comfort, it manages to do so without compromising the fine balance and rock solid body control. This really is one of those SUVs, like certain Porsche Cayennes and Macans, that forgets it’s a tall 4x4 when you want to get a lick on - helped by a sports steering rack that’s accurate and beautifully weighted.
Electronically controlled adaptive dampers come as standard, and the set-up is firm but never uncomfortably so. As with many Alpinas, it is easy to forget that you’re sitting on 20in alloy wheels (255/40 ZR20 at the front, and 285/35 ZR20 at the rear).
Refinement at cruising speeds is only just above average, mind you - not because of the engine, which fades into a hush once you’re up to speed, but because of the amount of road roar generated by those jumbo alloys. There’s a bit of wind patter from around the side mirrors at speed, too, but the overall noise level never gets close to being annoying on a long journey.
The improvements to the XD3’s cabin are modest but it’s still nicely finished, with a mix of fine materials and Alpina’s trademark blue instrument dials sitting alongside BMW’s proven infotainment systems and electrics. The personal touch offered by Alpina means that, should you wish, you can customise the materials and colours used until you’re well past the boundaries of taste and common sense.
The standard equipment list is also a lengthy one, with the XD3 adorned with dual-zone climate control, cruise control, xenon headlights, 20in alloy wheels, electrically adjustable and heated front seats, a Nevada leather upholstery, parking sensors and BMW's iDrive infotainment system with a 6.5in display, sat nav, Bluetooth, USB connectivity and DAB radio.
There are a few high-performance diesel 4x4s on the market, and it’s worth noting that the extremely proficient (and much cheaper) Porsche Macan S diesel has turned up since the original XD3 was launched. However, Stuttgart’s offering can’t match the raw performance on offer here, which is more in line with that of a Macan Turbo S.
Alpina’s facelift has enhanced an already strong package, then, making this one of the most appealing fast SUVs on the market. That limited UK allocation of vehicles is bordering on the offensive.