I think 18 in the front and 20 in the back would be a perfect fit for the M4.. Gotta get me some of these soon!!
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///M4 | Alpine White | Sakhir Orange Leather | Carbon Fiber Trim & Roof | DCT | Black 19" Wheels | Executive Package | Driver Assistance Plus Package | Adaptive M Suspension | Enhanced USB | Parking Assist | Harman Kardon
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