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BMW announced a series of new features and drivetrains for the 3 Series and 4 Series models, including an optional M Carbon roof. Previously offered only on the range-topping M3 and M4 models, the carbon-fiber roof is no offered on lower-tier versions of the compact. Specifically, you can order it on the gas-powered M340i xDrive and M440i xDrive, as well as on the diesel-fed M340d xDrive and M440d xDrive variants.
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