Will this diffuser scrape on steep driveways or inclines?

Diffusers add minimal extension to the rear bumper profile. Ground clearance depends on your vehicle's suspension setup and ride height. Check your OEM bumper clearance on steep angles, then measure the diffuser extension against your current gap before installation.

Is this diffuser functional or purely cosmetic?

This diffuser is styled for visual impact. Real aerodynamic benefit requires specific airflow patterns and vehicle speed; focus on fitment, finish, and appearance when deciding if it matches your build goals.

What prep work do I need before painting?

Sand and prep the surface thoroughly before applying your chosen basecoat and clear. Proper surface prep ensures paint adhesion and a finish that lasts. Follow your paint supplier's guidelines for FRP preparation.