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Frankfurt preview: 2014 Alpina D3 Bi-Turbo

The D3 uses a 345-horsepower 3.0-liter diesel-burning straight-six engine.

German BMW tuner Alpina has unveiled the 2014 D3 Bi-Turbo ahead of its scheduled debut at next week's Frankfurt Motor Show.

Available as a wagon and a sedan, the 3-Series-based D3 Bi-Turbo is powered by an upgraded version of the diesel-burning 3.0-liter straight-six found under the hood of the 330d. Linked to an eight-speed automatic transmission manufactured by ZF, the six-cylinder sends 345 horsepower and 516 lb-ft. of torque to the rear wheels, enough to propel the D3 from zero to 62 mph in 4.6 seconds and on to a top speed of about 170 mph. A limited-slip differential and BMW's xDrive all-wheel drive technology are available at an extra cost.

When drive conservatively, the D3 returns up to 44 mpg in a mixed European cycle.

Outside, Alpina's latest sedan receives an aggressive front bumper characterized by a big air dam and a lip spoiler adorned with Alpina-specific decals. Wide multi-spoke alloy wheels mounted on low-profile tires help give the car a race-bred appearance.

Following its debut in Frankfurt, the Alpina D3 Bi-Turbo will go on sale in select European countries later this year. Pricing information will be available closer to its launch.

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