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Maybe I'm explaining myself wrong.
Our z4 I's have the same rear rotor size as a z4 Si but the Z4 I has smaller front rotors, what I'm selling brings the front rotors to Si size as its stock Si parts.
If you want to keep the ratio the same as the I front to back but want to go bigger you simply put 330i rear calipers and rotors on the rear.
So what I'm selling will not impact the car in any negative way you will be running the same front and rear size rotors as a Z4 si vs. The smaller front rotors in the "I"
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