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I would not change the final drive.
I curse the day I put a 3.62 in my E90. Acceleration traces show... zero discernible difference. If I could go back, I would keep it stock and run the OEM GTS software.
Absolutely never again. The OEM ratios were great. This isn't a piece of shit GT4 with the longest gearing known to mankind, the DCT/6MT M3 is well geared stock.
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