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M6 slightly faster, but it is just a BIG 2 seater, the 2 seats in the rear are a joke. M6 will retain its value more.
M5 is good if you need the room. Complete stealth car. Cheaper insurance. Sunroof.
Don't get the Porsche unless you intend to go to the race track. Noisy, small.
You can't really go wrong with either M5 / M6.....it really depends on how you are going to use your car. Good Luck!
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"Aerodynamics are for people who cannot build engines"......Enzo Ferrari
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