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Well SMG is associated with the transmission, so it shouldn't have any impact on the rear end gear, which you should be able to change out. Most people want to go for a lower ratio, but you'd want to get a higher ratio.
Disclaimer - I'm not an expert, these are just my educated thoughts.
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Current: '13 E92 M3 Euro Delivery
Gone: E86 M Coupe; E30 M3, E39 M5, E36 M3 |