Tonight on the Key Bridge entering Georgetown at about 8:34 PM, I was passed by what I think was a member's car, black 4.4i w/ LED tails and possibly an exhaust (or you were revving it out a little)

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2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options