Will this diffuser drag or scrape on steep driveways or inclines?

Rear diffusers extend the lower bumper line and are prone to contact on steep angles. Measure the OEM diffuser clearance on your vehicle, then assess the extension of this piece against your typical driving environment — steep parking garage ramps, driveway approach angles, and speed bumps. If you frequently navigate tight angles, ground clearance becomes a real consideration.

Is this diffuser purely cosmetic or does it provide actual aerodynamic function?

This piece follows C63 AMG styling cues and is designed for visual impact. Whether it produces measurable downforce depends on vehicle speed, body panel gaps, and airflow integrity of your entire rear bumper assembly. For functional aerodynamics, consistency across the entire rear end matters — this diffuser alone will not deliver track-level performance gains.

What prep work does the FRP need before paint?

Sand the surface thoroughly to promote paint adhesion, then clean off all dust. The exact grit and primer type depend on your chosen topcoat system — consult your paint supplier's technical specs for compatibility. FRP can be painted with standard automotive urethane or single-stage systems once properly prepped.