They are probably referring to if the diameter changes than so do your MPH which may effect the speed sensing side of things. But, its not like it is AWD so it really shouldn't make a drastic difference. Just have someone or yourself size up your wider wheels and tires so that your mph is not effected drastically.
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2017 Ford Focus RS Nitrous Blue "KB43VER"
2014 370z Mag Blk 6M "KOKURYU" (Black Dragon)
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