Will this diffuser scrape on steep driveways or inclines?

The diffuser adds minimal extension below the OEM bumper line. Check your current bumper clearance on steep angles—if the stock fascia clears your driveway, this unit will too. For particularly aggressive angles, verify clearance before installation.

Is this diffuser functional or cosmetic?

This is a fixed-panel design that adds visual definition to the rear fascia. It does not contain adjustable flaps or moveable components. Aerodynamic benefit depends on your driving speed and setup; it functions best as part of a complete aero package.

What fasteners do I need to bolt this on?

The diffuser uses the factory bumper mounting points. Reference your OEM service manual for the correct bolt size and torque specification for rear bumper hardware. Most installations use stainless fasteners to prevent corrosion.