Will this wing stay stable at highway speeds?

Yes. Carbon fiber's inherent rigidity and the three-piece structure provide sufficient support under sustained high-speed driving. Verify mounting bolt torque values in your vehicle's service manual to ensure secure attachment.

What's the best way to prep this before painting or clear-coating?

Sand the surface with appropriate grit to open the texture, then wipe clean of dust. Apply your chosen finish—many owners apply clear coat to protect the carbon weave and enhance depth. Avoid direct sunlight during curing.

How do I verify the mounting holes line up with my deck?

Before final installation, test-fit the wing assembly and mark the mounting locations on your rear deck. Compare those marks to the existing factory holes to confirm alignment. Minor gaps can be addressed with shims or adjustable fasteners.