Will this scrape on driveway approaches or steep inclines?

The SP-N diffuser extends beyond the stock bumper line. Test clearance on your typical approach angles and driveway grade before final installation. Adjusting your suspension ride height or avoiding extreme inclines will prevent contact.

Does this diffuser have functional downforce or is it cosmetic?

The SP-N design is primarily aesthetic. It enhances rear-end visual balance and complements aero-forward builds, but does not produce measurable downforce on its own. Pair it with other aero elements if you're targeting performance gains.

What prep and finish should I apply before installing?

Sand the surface with appropriate grit to scuff the primer, then apply your chosen paint or clear coat. FRP absorbs UV over time, so a quality topcoat protects against fading and keeps the finish fresh longer than bare primer.