Will this diffuser scrape on speed bumps or steep driveways?

The Malve design extends the rear profile without aggressive downforce geometry. Check your vehicle's current ground clearance and compare it to your typical driving conditions—driveways, parking lots, and incline angles. If you already scrape the factory rear fascia, this diffuser will add additional extension and risk similar contact.

Is this a functional diffuser or purely cosmetic?

This is a styling diffuser. It replicates the appearance of aerodynamic diffusers but is not engineered for airflow management or downforce. It works as a visual complement to your rear bumper and rear quarter aesthetic.

What fasteners do I need to install this?

The diffuser is designed to mount to existing OEM bumper holes and attachment points. Verify your vehicle's rear bumper mounting pattern before ordering, and source appropriate fasteners (bolts or clips) separately based on your bumper configuration and drilling needs.