It's because of your Motronic Unit (the computer) having self-limiters in it. If you want to change your computer's settings, go to www.bavauto.com and they sell "chips" or a programmer to allow you to reach top speeds by bypassing the limiters within your Factory Computer...known to us "Bimmer" enthusiasts as a Motronic.
Hope this Helps,
~00 Buck~
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