if you are curious, there is a calculator under the wheel and tire section of this forum!
you just type in your stock setup, and then type in the new setup and it will tell you if the rolling diameter is more than 1%. if it is, dont do it! for the xi that is, I dont think it matters one lick if you have the rwd.
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335xi - BMS DCI - VRSF DP's - JB4 Tune - KW v1 -
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