Will this interfere with the trunk seal or hatch operation?

The rear lip design is engineered to clear the trunk latch area. Before installation, dry-fit the spoiler and verify clearance with your trunk fully open and closed. If your vehicle has aftermarket liftgate hardware or a modified hatch, test fitment before permanently securing.

Should I use adhesive or drill mounting holes?

Both methods work—adhesive creates a cleaner look with no visible fasteners, while drilling provides a mechanical bond. Adhesive requires thorough surface prep and is best for FRP-to-metal bonding. Drilling lets you use traditional fasteners and is more serviceable later. Choose based on your finish plan and whether you want visible hardware.

How stable is this at highway speeds?

FRP diffusers are rigid and vibration-resistant when properly mounted. Ensure all mounting points are secure and evenly tensioned—uneven fastening or incomplete adhesive coverage can cause flex. A solid installation with full surface contact delivers stability matching OEM parts.