I never noticed, but I saw an E46 328 today with the rear view mirrors flipped up the same way as our E39 M5s....
I thought it was unique to the M5... =(
It would also be unique if you put a big tail on it and an M Motorsport sticker. You guys have to chill out about this exclusivity thing. You can get that with DeLorean.
This is a one-of-a-kind prototype of a "might get marketed" new Hispano-Suiza.
Hispano-Suiza made some of the best cars in the world back in the '20s - they were considered superior to Rolls-Royce. They also made a lot of WW1 aircraft engines.