If you can't get the pieces off of the vertical vent, just remove the vertical vent. There's two tabs along the edge closest to the sidemarker. One above and one below a little more than half the distance from the sidemarker.
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'13 35i M-Sport X3 | JB4 Stage 1 | BMS Intake | H&R Springs | Gloss black grill | CF Wrap and Coded by me | Recaro Child Seats
'15 M3 DCT AW/SO | JB Stage 1 | RKP Diffuser | P3 | M Perf Spoiler | iND Exterior Trim | Recaro Child Seat
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