If you go with the DCT you will need to address the transmission cooling. That is assuming you are a keen driver and will run on R-comp tires. In that case you will run into issues with the combined thermal load of the engine and transmission loading the main radiator. The M3 has the same DCT transmission, but less engine torque and a separate transmission cooler. Personally I'm a "big fan" of the DCT, but it will be more complex and costly for any issues associated with it.
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