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Weight wise, steel driveshaft actually outperform the carbon driveshaft. Because although heavier for the given strength, steel is smaller (exactly what made fitting GPF possible) and thus rotating mass is much less. Meaning, steel shaft is lighter and easier to handle at speed.
M3/M4 doesn't have enough power to bother with a carbon driveshaft, knowing, yes, 1000hp will be the new norm in the G8X aftermarket. Many things can fail along the way, before you will have to worry about the shaft.
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Lemania 2320
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