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3 series vs 4 series roof?
Does anyone know what the ratio is in size between a 3 series and 4 series roof? It seems that the 3 series would be significantly larger due to more upright A and C (B in the case of the 4 series ) pillars but is it and by how much? I'm thinking that the CF roof on the F80 could save more weight where you least want it ( up top ) than what it did on the E92 and will do on the M4.
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