Will this diffuser scrape on steep driveways or ramps?

The diffuser extends beyond the factory bumper profile. Measure your current ride height and driveway approach angle before installation. If you run lowered suspension, verify ground clearance at your typical entry/exit points — the diffuser will follow your vehicle's natural rake angle.

Does this provide functional downforce or is it cosmetic?

This is a styling piece designed to match M Performance aesthetics. It complements the rear bumper visually. For aerodynamic performance claims, consult independent testing — styling diffusers operate differently than full-stage aero packages.

What prep work should I do before painting?

Sand and prep the surface according to your chosen paint system's requirements. FRP accepts standard automotive primers and finishes. Follow the paint manufacturer's surface prep guidelines for adhesion and durability.