Only cds that ever skipped over bumps in my stock HU were CD-Rs. I guess the laser in the stock head is weak and has a harder time tracking a CD-R. Store bought CDs never skipped on me. And CD-Rs never skipped in the Alpine changer in the trunk.
This is in a 330Ci sport suspension, 17" sport package rims. Different rims and lower suspensions may cause more skipping.
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