Quote:
Originally Posted by Brian-bmw
I do not know of any incompatibility between the various SES part numbers and the model year of your car. To be specific, an SES from a 2001 7 Series would work perfectly well in your car. This part is generally considered to be interchangeable between all applicable cars (E38 7 Series, E39 5 Series, E46 3 Series, E53 X5, E83 X3, and E85 Z4).
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Thanks, Brian. That is very good to know. I'm still comparing the ULF vs. TCU/SES. With the TCU/SES, I like the fact that the car automatically goes into pairing mode when turned on. Conversely, it seems that the ULF option is practical only to the extent that I can (or want to) either--
a) Retrofit my 2003 M3 with an Eject Box; or
b) Somehow acquire a pairing button, which seem very difficult to find; or
c) Make my own pairing button.
Of course, the ULF has the advantage of being an all-in-one unit. Fewer parts to go bad.