I went with non run flats on our X3 and threw a tire repair kit in the back, will do the same with our 335, but TPMS is almost a must, and from what I have been reading it sounds like its "illegal" to not put TPM on your wheels tires if your car comes equipped with the system, at least thats what tirerack and other tire places are now saying (but that could be a load of BS, since its a $360 extra for it now, which is insane).
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