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The Alpina XD3 Biturbo is judged to perfection; fast, rewarding and no less versatile than any BMW X3

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The shape of the Alpina XD3 Biturbo may be familiar, but this BMW X3-based model is the first SUV in Alpina’s history. That in itself is significant enough, but the fact that the Alpina XD3 is also the fastest-accelerating diesel-engined SUV you can buy makes it something of a landmark vehicle.

The stats are deeply impressive. In Alpina spec, BMW’s already stonking twin-turbo 3.0-litre diesel gets a 36bhp power boost to 345bhp and an extra 52lb ft of torque at 516lb ft, largely thanks to optimised air intake and exhaust flows. That’s enough to propel the 1910kg Alpina XD3 from 0-62mph in an eye-watering 4.9sec – a level of acceleration that you’d need a Porsche Cayenne Turbo to beat.

Renowned exhaust specialist Akrapovič had a hand in the XD3’s system; no wonder it sounds good

There’s a small penalty to pay in terms of fuel economy and emissions compared with the standard X3 xDrive35d, but the XD3’s 41.5mpg combined and 180g/km of CO2 remain on a par with the class best, notably the 309bhp bi-turbo Audi SQ5.

The XD3’s performance is every bit as urgent as those figures suggest. Mated to a recalibrated ZF eight-speed automatic transmission, the uprated engine revs relatively enthusiastically for a big diesel and produces an encouragingly throaty growl in the upper half of its rev range, but it’s the relentless torque that dominates the way the XD3 goes down the road. In short, it goes like stink.

As always, it’s the work Alpina has done on the chassis side that is the key difference between one of its products and the BMW equivalent, but in this case the incremental gains seem greater than on recent 3-series or 5-series-based offerings and make the XD3 feel genuinely sporting by SUV standards.

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With a standard spec that includes electronically controlled adaptive dampers, four-mode Drive Performance Control and a variable-ratio sports steering rack, the Alpina XD3’s suspension tune has been judged to perfection: firm, but not too firm. Handling is agile and sweetly balanced and body control is exemplary, yet there’s still some compliance in the ride at low speeds, in Comfort mode at least. Sport mode can get a bit jiggly on UK roads, but overall the XD3 rides better than the Cayenne, for example.

None of the Alpina tweaks detract from the fundamental usability and practicality of the X3, either. The cabin is roomy and comfortable, the load bay is huge and the already high-quality materials are taken up another notch with Alpina’s remodelling, which on the XD3 includes optional Alcantara trim with contrasting stitching for the doors, fascia and entire top of the centre console. Alpina’s trademark shift buttons on the back of the steering wheel are less satisfying to operate than paddles, though.

Given the high standard set by BMW in the first place, especially on the 3 Series, it’s sometimes hard to see where Alpina can make much of a difference, but in this case they’ve excelled themselves. The XD3 feels like a significant step forward compared with the standard X3, making it one of the most exciting, most complete SUVs on the market.