Allright, I've been thinkin about this for a while and I am going to sell my 3.38 diff. The reason why I am selling is b/c I drive 30 mins to work on the highway everyday and driving at the higher rpms is killing my gas mileage. I would rather sell it, but I might be willing to trade it for 3.15 diff and some cash. I bought the diff brand new from BMW and it has 6000 miles on it currently. Please email me @ [email protected]. I will be opened to all offers. Thank you very much.