Will this diffuser scrape on steep driveways or speed bumps?

The diffuser extends below the rear bumper line, so approach angle matters on inclines. Measure your current ground clearance at the lowest rear body point and compare it to your driveway geometry before installation. If you frequent steep entries or unpaved surfaces, test fitment at low speeds first.

Is this functional aerodynamics or cosmetic styling?

This is a GT tuning piece — it's designed for visual impact and cohesive track-car aesthetics. While the diffuser channels redirect airflow, the primary benefit is styling alignment with aggressive rear bumper kits. Don't expect measurable downforce; expect a complete rear-end package.

What prep work does the FRP need before I paint it?

Sand and prep the surface thoroughly before applying your chosen primer or paint system. FRP accepts standard automotive finishes, but surface contamination or improper prep will show through the topcoat. Consult your paint supplier's recommendations for FRP-specific primers if you want maximum adhesion.