Cf-roof, best place to save weigth and make center gravity lower, looks fantastic and show that Bmw really wan´t make F80 light. I think is mistake if Bmw don´t offer cf-roof optional. Actually Bmw has expanded Moses Lake plant, they can make 3000 tonnes of carbon weave a year, one of the biggest carbon yarn producers. i3 carbon parts cost only third as much than composite roof on the M3.
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