Do I need fasteners to install this, or does it come with hardware?

This splitter ships as the panel only. You'll need to source mounting hardware appropriate for your bumper's existing attachment points. Before drilling, verify your bumper's hole locations and fastener pattern against OEM documentation for your vehicle.

What prep work is required before painting?

Sand the FRP surface to remove the mold release and create tooth for paint adhesion. After sanding and cleaning, apply your choice of primer and topcoat. A clear protective coat is recommended to maintain finish durability and UV resistance over time.

Are the side fins included, or do I need to order them separately?

Fins are sold separately. This order includes only the main splitter panel. You can add compatible fin sections to your build as a second purchase if desired.