Will this interfere with the trunk seal?

The diffuser sits below the main bumper line and does not extend into the trunk cavity. Verify clearance against your vehicle's rear bumper geometry before final installation to confirm proper fitment with your specific setup.

Does this design require drilling into the bumper?

This is a two-piece assembly designed to integrate with factory mounting points. Reference your vehicle's OEM bumper structure and fastener locations before beginning installation to determine the best attachment method for your bumper type.

How should I prep the FRP before painting?

Sand and prep the surface with standard automotive prep techniques before applying your chosen paint or clear coat. Follow your paint manufacturer's guidelines for surface preparation and application on FRP substrates.