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1. there shouldn't be a difference besides coming from the BWM factory vs. China (as in the ones I'm looking at).
2. run flats are more expensive and i had one patch/plugged...held up fine. BMW suggests buying new but only difference that i heard of is RF are thicker and that's why you can drive farther at slower speeds until you get it replaced (or repaired).
the 550i M wheels are nice but it sucks cleaning between all those spokes. take care and drive fast!!
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