Do I need to drill holes or modify the rear bumper for installation?

Review your vehicle's OEM rear panel for existing mounting points and hole locations before beginning installation. The diffuser pieces are engineered to align with factory geometry, but verification on your specific vehicle ensures a clean fit without unnecessary modifications.

Should I sand and prime this before painting?

Yes. Sand the surface with appropriate grit to smooth any minor imperfections and improve adhesion, then apply your chosen primer and topcoat system. This prep ensures a professional, durable finish that matches your vehicle's paint.

Can the two pieces be installed separately, or do they need to go on together?

The two-piece design allows staggered installation — you can fit one diffuser at a time. This is useful if you're working with limited space or want to verify fitment and alignment on one side before completing the other.