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275/30R20 on the back would reduce the height and width a little bit, but the bigger issue here is the 20" wheels. Before you worry about the effect of a fraction of an inch diameter on acceleration, worry about the weight and rotational inertia of your 20's.
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I have accepted a new position at Tire Rack and am no longer in the sales department. gary@tirerack.com is available to assist with M3 questions. |