Will this wing stay stable at highway speeds?

Yes. Single-piece carbon construction provides the rigidity needed for high-speed stability. Before installation, verify mounting hole alignment with your vehicle's mounting points to ensure even load distribution across fasteners.

What's the correct way to prepare the surface before installation?

Sand and prep the mounting surface on your vehicle to ensure clean contact. Your vehicle's service manual will specify any fastener torque values once you've drilled or aligned the mounting holes. Proper surface prep prevents movement and vibration.

Does this require any finishing work out of the box?

The carbon fiber arrives ready to install. If you want to protect the weave and enhance gloss, apply a UV-protective clear coat after mounting. This preserves the finish and prevents oxidation over time.