Both the M3 and the 550 are fast cars. The difference is in the M3 you want to drive it fast where as the 550 you don't and would likely just cruise with it. That how it was for me when I had my 550. Sure when you romp on the gas pedal the 550 moves but you just don't get the same feeling that you WANT to drive it like you would in the M3.
Alan
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