Because the torsional load of carbon fiber isn't any better than steel and the harmonics are worse so it really only gives you an.advantage in rotating mass. Which I agree is important but what's the price on a.cf driveshaft
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2014 335i M Sport
2010 328i M Sport
2007 Z4MC #1019/1815 (Sold)
1997 M3 (Sold)
1991 325i
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