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I've been considering doing this for my 2008 328i MT. It is easy to swap the auto diff (3.73) for my MT diff (3.23) on the 2007-2008 models like it is for the 2006 models? Can i use the diff from an auto 335i (3.46)?
The thought of having 15% more torque applied to the rear wheels is very appealing but I too am concerned about the increased revs on the highway. To get a feel for what it would be like, I downshifted from 6th to 5th gear while going 70 mph. There's about a 15% difference between those gears. I don't think I want the higher revs because I spend a lot of time on the highway.
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