I also think it's tires. I always run 2 sets of wheels and tires with full on 3-peak snow tires. Every vehicle I've had doesn't track nearly as well on snow tires. The steering gets twitchy. There is less traction on dry warm pavement.
I test drove the M240i with the high performance wheels and tires at 70F and steering was perfect. Those were the Michelin summer high perf tires.
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