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Not a tranny expert so I would not want to mislead. My car is my daily driver and the 4.10 is just fine. You shift more, and my mpg is down 0.5 mpg before my tune. It directionally is back to stock mpg now that I have the ESS tune but I am only on my second tank of gas though. My tuning shop advises people get the 4.10 over te 3.91 but I believe they are both major improvements over stock. Ask Epbrown what he thinks about his 3.91 (I believe he loves it). I am sure he and I will have a better way to compare this spring if he shows up for some local meets. I would like to let him drive mine and maybe drive his to see if there is real difference :P
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2007 M Coupe w/NAV/Premium/Extended Leather, Clearbra, DICE, 4.10 BMW Motorsport Polished LSD, Active Autowerke Gen IV Headers, Supersprint Race Exhaust and X-Pipe, ESS Tuned DME, KWV3 Coilovers, Volk RE30, OEM Strut Tower Brace, Short Antenna, JL AMP, JL 10W7, Valentine V1.
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