Alpina has launched a new generation of saloons and estates, claiming to produce the world's fastest diesel car.

With 350hp and 516lb-ft of torque, the new D3 Bi-Turbo (based on the BMW 3 Series) will accelerate from 0-62mph in 4.6 seconds and has a maximum speed of 173mph

However, it has has combined cycle fuel economy of 53.2 mpg and CO2 emissions of 139 g/km.

"What makes these figures even more remarkable is that the D3 Bi-Turbo is also a luxury car that delivers its world-beating performance alongside uncompromising comfort and refinement," said Matthew Stripling, sales manager at Alpina GB. "The new six cylinder D3 has a wonderful bespoke feel that touches all the senses to make every journey a pleasure, whether commuting to work or powering through the mountains."

The D3 Bi-Turbo is the result of a two-year development programme during which every aspect of the vehicle was analysed as Alpina sought to increase performance and style. Using design and validation processes identical to those implemented by BMW, Alpina’s team of 50 development engineers worked with specialist suppliers to enhance the engine, gearbox, cooling system, body structure, wheels, tyres, aerodynamics, suspension and interior.

The BMW Alpina D3 Bi-Turbo is available in the UK as a saloon for £46,950 or as a Touring (estate) for £49,950, with standard equipment that includes an eight-speed automatic gearbox, adaptive M Sport suspension, leather upholstery, electrically adjustable heated sports seats, climate control and bi-xenon headlights. Inside, there are luxury carpet overmats and subtle Alpina logos on the seat backs and door sills. The instruments are in Alpina Blue and the steering wheel is covered in hand-stitched Lavalina leather.

Outside, the new D3 Bi-Turbo receives subtle aerodynamic enhancements developed in BMW’s wind tunnel, a four outlet exhaust with an ‘intelligent’ acoustic valve, and 19-inch Alpina alloy wheels in the company’s famous Classic design. Every car is finished with a model plaque displayed on the centre console, showing the car’s unique build number.

"The D3 will be attractive to business users who have the resources to purchase a high-performance luxury car but have been put-off by the high taxation,” says Stripling. “Alpina has traditionally been the choice of informed professionals who enjoy fine technology and attention to detail. With such a competitive package, the D3 Bi-Turbo is sure to prove successful in this discerning market."

ALPINA has worked closely with BMW since 1961, with shared warranty coverage since 1964.