Will this diffuser scrape on driveways or steep inclines?

The Circuit diffuser is designed to integrate with factory ground clearance and does not extend lower than OEM styling. Inspect your driveway approach angle and compare to the stock bumper profile. If your vehicle clears factory bumpers without scraping, this diffuser will perform the same way.

Does this provide functional downforce or is it cosmetic only?

The Circuit style is a visual enhancement that complements factory proportions. Any aerodynamic benefit from diffuser design occurs at highway speeds, but the primary purpose here is styling. Install with realistic expectations about performance gains.

What prep and finish do I need to apply before installation?

Carbon fiber ships unfinished. Sand the surface with appropriate grit, then apply clearcoat to protect the weave pattern and prevent UV degradation. Work with a detail shop or experienced builder if you're unfamiliar with composite finishing. Proper prep ensures longevity and gloss retention.