Will this diffuser scrape on inclines or speed bumps?

The SRK profile is designed with minimal extension to the rear bumper, keeping ground clearance close to OEM levels. Test fit on your driveway slope or typical parking lot transition before final installation to ensure clearance with your suspension setup and ride height.

Is this purely cosmetic or does it add functional downforce?

This is a styling diffuser optimized for visual impact and curb appeal. While the design mirrors aggressive aerodynamic profiles, real downforce gains require a complete aero package—engine bay venting, underbody sealing, and suspension tuning. Use it for the look you want.

What prep work is required before painting?

Sand the surface lightly to ensure adhesion, then clean thoroughly to remove dust. Follow your chosen paint system's surface prep guidelines for best results. FRP accepts standard automotive primers and topcoats without issue.