Does this wing work standalone or does it need the OEM spoiler?

This is an add-on piece designed to mount over your factory spoiler. It is not a standalone replacement. Your OEM spoiler stays in place and provides the base.

What's the mounting hole pattern — does it match factory attachment points?

The wing mounts using existing OEM spoiler mounting locations. Before installation, verify your factory spoiler hardware is in good condition and properly torqued. Refer to your vehicle service manual for correct fastener specifications.

Will this interfere with trunk lid operation?

The M Spec profile is designed to clear the trunk lid when fully opened. Check clearance on your specific vehicle before final fastener tightening, especially if your trunk has aftermarket weatherstripping or custom hardware.