Will these plug directly into my factory fog light wiring?

Yes. These use a factory-compatible connector, so they wire straight into your existing harness without modification or adapter.

Do I need to modify or reprogram anything for the LEDs to work?

No reprogramming required. Install the housings in place of your OEM fogs, connect the plug, and they're live. No coding.

What's the difference between these and a standard LED fog light?

Tri-projector optics deliver three distinct light zones per housing instead of one flood pattern, giving you tighter, more usable illumination without the washout common in cheaper single-projector LEDs.