I agree with the above comments. Takes a few hours, straightforward job.
Read through the BMW instructions that come with the OE tow bar (EU version) to decide for yourself:
http://www.bmwmotorsports.org/pdf/e5...iler_hitch.pdf
Some later model years have required recoding by the dealer so that the trailer lighting module is recognized by the vehicle. You list an 03 model in your profile, and my 2003 model didn't require recoding, so you should be fine.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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