I agree with the recommendation for the Dynavin. I've had one in my car for almost six months now, and I love it. It requires some tweaking (of the software) to get things just the way you like, but that's part of the fun.

Also, it looks completely OEM.

Just my two cents.
John

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'07 328i convertible
'03 X5 4.4i
'93 318i sedan