Will this diffuser scrape on driveways or steep inclines?

Diffusers sit low and protrude slightly from the bumper. Before installation, measure your current ground clearance and test your typical routes (driveway approach angles, speed bumps, parking lot ramps). If you frequently bottom out, verify clearance at the mounting points and consider your driving habits. The three-piece design lets you position each section to your exact ride height.

Does this add functional downforce or is it cosmetic?

This is a styling piece designed to enhance the rear end appearance and complete the Meller aesthetic. Measurable aerodynamic benefit depends on speed, vehicle setup, and track conditions—not the diffuser alone. If your goal is functional aero, pair this with a complete aero package and consult aero data specific to your build.

What finish should I apply to the carbon fiber?

Carbon fiber arrives factory-finished with clear coat. You can install and drive as-is. If you prefer additional UV protection or a different gloss level, sand the surface and apply your chosen automotive clear coat. Avoid wax on raw carbon for the first few months to allow proper cure.