Will the diffuser scrape on driveways or steep inclines?

The diffuser extends minimally beyond the factory bumper line. Verify ground clearance on your vehicle's current suspension setup before installation—lowered suspensions may reduce clearance on steep approach angles.

Is this functional downforce or purely cosmetic?

This is styled to match M Performance design language. It delivers visual impact consistent with that trim look; aerodynamic benefit depends on overall vehicle setup and driving speeds.

What prep work is required before painting?

Sand the surface thoroughly and clean all dust before applying base coat. Follow your paint product's surface prep guidelines for proper adhesion and finish quality.