Will this scrape on steep driveway approaches or parking lot inclines?

The diffuser sits integrated into your rear bumper profile, so clearance matches your factory bumper height. If your vehicle already clears standard driveways and parking lot angles, the diffuser won't change that. Verify clearance with your current bumper first.

Is this purely visual, or does it add any functional downforce?

Tando diffuser styling is designed for appearance and rear-end definition. For measurable aerodynamic benefit, you'd need a full rear wing or integrated splitter system. This piece completes the aggressive look without adding wings or complex aero hardware.

What finish prep should I do before installation?

Sand and prep the bumper mounting surface to remove any debris or old adhesive, then dry completely. If your bumper is new or freshly painted, verify the surface is fully cured before attachment. The diffuser itself arrives ready to mount — no additional prep needed on the carbon fiber.