Will this interfere with the trunk lid when it's open?

No. The GT-S profile is designed to sit clear of the trunk opening arc. Verify clearance on your specific vehicle before final installation, as aftermarket modifications to the rear panel may affect fit.

How do I prepare this wing for painting?

Sand and prep the surface with appropriate grit before applying your chosen base coat and topcoat. Follow your paint manufacturer's prep and application guidelines for best results.

Does this use the factory mounting holes?

Yes. The wing references the stock roof attachment points. Confirm your vehicle's mounting hole pattern matches the standard configuration before drilling or fastening.