m5board.comoholic (>1000 posts)
Join Date: Dec 2012
Location: New Jersey
Thanked 129 Times in 118 Posts
If you get it from the dealership it'll be all set for your car and basically work. You may need to remove the missing key from the CAS for seat memory and settigns.
There are blanks and programmers from china but that's the hard way , sometimes cheaper isn't worth it.
The other thing is there are only 10 reprogrammed slots for the car so you can only go to the dealership for a key 8 times.
2001 E36/7 MRoadster
2001 E39 M5
2010 E60 M5
2008 E90 335xi