exchange

I would like to replace my differential on my 2005 320i E90 with 3.38 ratio with a 2010 E90 LCI diff with ration 3.64. Is this possible and should there be any negative effects?

so i have a 1994 318i and a 1992 325i. Im trying to get the front seats from the 318i into the 325i but the cables under the seats(which I'm guessing are the airbag sensors) are have different connectors. So i just didn't connect them and now my car is constantly making a dinging sound wether on...

I will be using a Credit Card as much as possible but have to have Euros for a couple of big expenses to get discount. Have 3 questions. Anyone know if I will get the best exchange rate for cash at a Bank in the US or at a Bank in Germany? Also, in some countries it is difficult to exchange US...