Will this interfere with my trunk seal or weatherstripping?

Polyurethane spoilers have flex built in. Dry-fit first and verify clearance at the seal line before final installation. The factory mounting points should align without crushing or distorting the gasket, but always check your specific trunk frame before committing fasteners.

Does this require drilling, or does it use adhesive?

Mounting method not confirmed in the listing. Test-fit the spoiler at the factory attachment points first. Depending on your trunk design and desired permanence, you may use fasteners at existing holes, drill new mounting points, or combine both methods. Verify alignment and fitment before any drilling or adhesive application.

Will this spoiler hold up at highway speeds?

Polyurethane is stable and resistant to flex and cracking at speed. Make sure mounting is solid and fully seated — loose fasteners or poor contact with the trunk surface will cause vibration. Secure installation is the key to reliable performance on the highway.