Depends on what e90 you got, PRE-LCI you gotta remove the fender liner, then remove the box housing the AEs (two clips, just use two flatheads), remove two Torx bolts (its the typical BMW smallish ones), unmount the AEs, remove the plastic housing, reassemble the AE, tighten bolts, put the seal back on the box housing, replace your fender liner, and then repeat for the other side. 0.5 out of 5 difficulty lol.
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