Will this diffuser scrape on steep driveways or inclines?

Rear diffusers sit lower than the bumper, so inspect your driveway approach angles and verify ground clearance against the lowest point of your vehicle's current bumper. Most owners report zero issues on standard residential grades. If you frequent steep parking structures, measure the diffuser depth and compare it to your current ride height.

Is this functional aero or purely cosmetic?

The Energon style is primarily a visual enhancement. The vane design adds aesthetic aggression to the rear fascia without active aerodynamic function. If downforce performance is your goal, consult aero specialists for validated CFD designs; this diffuser excels at style.

What prep is required before paint or coating?

Sand the surface lightly to ensure adhesion, then apply your chosen finish system—urethane, single-stage, or protective clear coat all work well on FRP. Standard automotive preparation steps apply; your paint supplier can recommend grit and primer compatibility for FRP substrates.