Do these diffusers require any drilling or modifications to the existing bumper?

The diffusers are engineered to mount using factory attachment points on your rear bumper. Before installation, verify your vehicle's OEM bumper hole locations and mounting tabs match the diffuser design. Minor surface prep may be necessary depending on fitment gaps.

What prep work is needed before I paint these?

Sand the surface thoroughly to ensure paint adhesion, then wipe clean of all dust and debris. Apply your chosen paint system directly over the prepared FRP. Primer compatibility depends on your paint supplier's recommendations for fiberglass-reinforced plastics.

Will these pieces fit flush against my rear bumper cover?

These are designed to sit beneath the rear bumper as lower add-ons. Gap consistency depends on proper alignment during installation. Test-fit before fastening to confirm fitment with your bumper's profile and any existing hardware.