There are car covers that are made specifically for the M5. They are anywhere from $75 (indoor use, dust) to $200 (snow and hard rain)depending on manufactorer, color and materials. I purchased from Blue Sky. They advertise in the back of all of the car magazines.
I agree with the post about a low profile. Under the cover it should look like any other 5 series if you do not advertise what is there.
Blue Sky had a very nice web site that descibes all of the various grades of covers and what may or may not fit your needs. I believe the cover I purchased was $170. Not the most expensive, but not the least.
If your in Southern California your not interested in rain protection because it never rains here, just sun protection.
Hope this helps,
Mark
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