I'm mostly concerned about weight and trunk space. I don't care about a hardtop if it eats all my trunk space and weights a lot more than a soft top. The current Z4 has the lowest power to weight ratio relative to engine type of all models in the BMW range. It's better than the competition as well. I wouldn't like the Z4 replacement to be the next Brera (the 3538 lbs / 1605 kg Alfa '159 Convertible').
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