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The 550 has 8 gears. Even stock it should keep up with one in a straight line. Modded it would most likely walk one, but the M3 will always remain the more pleasurable drive and the tool for the track mechanically.
A 550 is a massive car these days, an M3 will have to wind it's chicken legs to keep up driving aggressively in traffic ssuming the roads are straight and wide like most American cities. The torque is awesome around town. Try a tuned 335 to get a feeling for it if that's what you like
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