I had mine cut out with a razor nife. The BMW dealership heated up the insert with a heat gun to make it more pliable and then cut it down the middle. It wasn't easy but they did a nice job. I then rolled the lip in about 1/8th of an inch. I am running 19x10 on the rear on my '04 330CIC conv. No problems now. The entire process for both sides took about an hour and a half.
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