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I've driven both the 535i and the 550i. The 550i is quieter on full throttle accelleration, but at cruise, they are similar. The tire size option will make a difference in the road noise and feel. For max comfort, the 18" stock wheels and tires will be more comfortable (taller sidewall to act as a cushion), although the larger tires look nicer. My feeling is, I can't see the tires while I'm driving, and I don't really look at the car much while it is parked, so I don't put that much in how it looks. For max cornering, the bigger wheels are good, but few people ever use it. Bigger wheels are not great in the NE where you get a lot of potholes, either!
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