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3.45 diff.
I have it and love it. I am running 20" BBS LMR, so for me I was just looking to re-coup some of the torque I lost with these bigger wheels.
Gears are definitely a win-win for acceleration, especially with a DCT and a motor that has so little torque. There is a reason that at every race track in professional racing, gears are always changed to match the top end speed available at that particular track. I have never seen the top revs in my M3 in 7th gear, ever, so it"s a no brainer IMO.
The 3.62 can cause issues with the dct and downshifts, rev matching, clutch release timing, etc...I had this and went ot the 3.45 where it is perfect.
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