Our spy photographers have caught on camera a lightly facelifted prototype of the Alpina D3 Bi-Turbo Touring.

Our spy photographers have caught on camera a lightly facelifted prototype of the Alpina D3 Bi-Turbo Touring.

Besides putting the finishing touches on the all-new B7, Alpina is also working on a minor tuning program for the D3 Bi-Turbo which has been spotted testing in Touring guise ahead of an official reveal which should occur in the months to come. It's obviously based on the recently facelifted 3-Series Touring and will get slightly different front and rear bumpers along with the usual mechanical tweaks such as the sportier suspension setup, beefier brakes and Alpina's own turbine-style wheels.

We don't know whether Alpina's engineers plan to upgrade the six-cylinder, 3.0-liter turbodiesel but we can tell you that in current configuration it puts out 350 PS (257 kW) and 700 Nm (516 lb-ft) of torque. This enables the Touring version to run the 0-62 mph (0-100 km/h) sprint in 4.5 seconds and top out at 170 mph (274 km/h) when configured with the optional all-wheel drive system. The rear-wheel drive D3 Touring needs 0.1s more for the sprint, but has a slightly higher top speed at 171.5 mph (276 km/h).

As for the D3 Sedan, this can only be had with a rear-wheel drive layout and will reach 100 km/h from a standstill in 4.6 seconds en route to a maximum speed of 173 mph (278 km/h).

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Alpina D3 Bi-Turbo Touring facelift spied on a rainy day