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I think trimming the lip with a grinder results in a cleaner result and doesn't encourage paint cracking when folding the metal back. Use the grinder sparingly and use wet shop cloths to minimize heating the panel. On most 911s, the tire only interferes with the lip in a couple of areas (approx. 10 and 2 o'clock), easily blended into existing sheet metal.
In addition, the hem that results from folding back the lip creates a tight-fitting trough which tends to trap dirt, moisture and corrosive elements from the road (i.e. salt), all of which are NG.
Sherwood
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