Will this interfere with my bumper's existing trim or molding?

The lip is engineered to mount at factory attachment points on the E63 bumper. Before installation, verify that your bumper's lower trim and any integrated molding have adequate clearance at the mounting interface. If you've replaced the OEM bumper with an aftermarket variant, reference the replacement bumper's hole locations to confirm alignment.

Can I use adhesive instead of drilling, or do I need to bolt this on?

This lip is designed to use the factory mounting points already present on the E63 bumper—no drilling required. Confirm your bumper has these points intact before ordering. If you prefer adhesive supplementation after bolting, ensure the FRP surface is sanded and prepped to manufacturer specs for your chosen adhesive.

How stable is this at highway speeds, and will wind lift affect it?

FRP is rigid and holds its form under normal driving conditions. The single-piece design eliminates flex points that could cause vibration. Verify that all mounting fasteners are torqued securely and check them periodically—loose hardware, not the material itself, is the source of any rattling or movement at speed.