Will this wing stay stable at highway speed?

Yes. FRP construction and single-piece design provide rigid support. Verify all fasteners are torqued to factory specifications using your vehicle's service manual before highway driving.

Does this wing interfere with the trunk lid?

The slimline design is engineered to clear OEM trunk geometry. Before installation, dry-fit the wing and check clearance at full trunk opening to confirm fit with your specific vehicle's panels.

What mounting holes do I need to use?

This wing uses factory mounting points on the trunk lid. Locate your OEM spoiler attachment holes (or reference your service manual for exact hole pattern). Existing holes should align; if your vehicle has never had a spoiler, drill according to your manual's specifications.