Will this wing clear the trunk lid when it opens?

Yes. The design mounts flush to the lid surface without interference. Verify your trunk hinge clearance before final fastener tightening if you've modified the rear bodywork.

What mounting hole pattern does this use?

The wing is engineered to match factory trunk lid mounting points. Confirm your OEM fastener locations align with the pre-drilled holes before assembly; if you've replaced or modified the lid, test-fit first.

How stable is this at highway speeds?

FRP construction is rigid and designed for aerodynamic stability. Ensure all fasteners are fully seated and torqued according to your vehicle service manual; loose hardware will cause movement and potential noise.