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Tuning Green: Alpina D3

A few months back, longtime commenter Mattias (of Regards, Mattias fame) hipped us to Alpina's D3, the venerable BMW collaborator's take on the BMW 320d. Now, the D3's on the radar of Green Car Congress, which lauds the D3's high mileage and low C02 rating and Euro-4 compliance via particulate filter. Alpina applies a…