apexstrafer, the Ms have a different geometry than the non-Ms. Its not that anything is smaller (paneling is the same) but the positioning is different. Thus, different offsets work for the M than non M. If you go with high offsets like a non-M, you risk rubbing on the inside, instead of the outside. Its important that you take all the factors into consideration and go with what works on your car, not just what someone posts.
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