Will these scrape on steep driveway inclines?

The fin geometry is designed to sit within the OEM diffuser envelope, so incline clearance mirrors the factory bumper. Verify your current ride height and any suspension drops before installation — significant lowering may reduce ground clearance on angled driveways.

Is this functional downforce or cosmetic?

These fins work in concert with the factory diffuser to manage underbody airflow. At street speeds they provide visual aggression; at track speeds they contribute to aerodynamic balance. Think of them as functional styling — they're not a standalone wing, but they enhance the stock aero package.

Can I run just two fins instead of all four?

Yes. The four-piece design lets you mix and match. Some builders run outer fins only for a subtle look, others go full coverage. Each fin mounts independently at the factory attachment points, so you have flexibility in how aggressive you want the look to be.