Will these plug directly into my factory fog light harness?

These are hard-wired units designed to integrate with your existing fog light circuit. You'll need to run power directly from the factory fog connector and tie into the stock wiring—no plug-and-play adapters included.

Do I need to modify my bumper or fascia to install these?

The 3.5" round design fits into factory fog openings. If your vehicle came with fog lights, mounting points line up—no cutting required. If not, you'll need to verify your bumper has openings that can accept a 3.5" round housing.

Can I run these on a standard relay setup, or do they need their own circuit?

LED units draw less current than halogen fogs, so most factory fog relay setups will handle them without upgrade. Confirm your existing relay and wiring gauge can support the load before install—if you're unsure, use a dedicated relay and wire kit rated for LED.