Will this wing mount to the existing factory spoiler bracket without drilling?

Yes. The Ergo design is engineered to use the OEM mounting hole pattern. Before you order, verify that your sedan's rear trunk has the factory spoiler mounting points — some trim levels use a different configuration. Check your vehicle's service manual or consult your owner's documentation to confirm the exact hole spacing.

Does this carbon fiber need any prep or finish before installation?

The wing ships ready to bolt on. For best appearance and durability, inspect the clear coat finish before mounting. If you plan to customize the finish or repair any minor imperfections, sand the surface lightly and apply your chosen primer and paint system. Carbon fiber benefits from UV-protective topcoat to prevent finish yellowing over time.

How stable is this wing at highway speeds?

The Ergo profile and carbon fiber rigidity keep the wing flat and vibration-free at normal driving speeds. The single-piece construction eliminates flex points. For optimal stability, ensure all fasteners are torqued evenly and check them after the first 100 miles of driving. Refer to your vehicle's service manual for the correct fastener torque specifications.