Will this diffuser scrape on ramps or steep inclines?

Rear diffusers are mounted to the lower bumper area and sit slightly below the body line. Check your vehicle's current ride height and bumper geometry before installation. If you've lowered the suspension, verify ground clearance at the bumper mounting points — the diffuser will follow that same plane.

Is this functional or cosmetic?

The Lexios profile is a styling element designed to enhance the rear-quarter appearance. Real downforce gains require a full aerodynamic package and wind tunnel validation. This diffuser complements factory or sport bumpers visually.

What preparation does FRP need before paint?

Sand the entire surface with appropriate grit to remove the mold release agent and create a profile for primer adhesion. Follow your primer and paint manufacturer's prep instructions for best results. FRP accepts most automotive finishes once properly prepped.