Does this kit come with everything to wire it up?

Yes — wiring harness and switch are included. You'll just need to route the harness into the cabin and decide where to mount the switch. No relay or additional components required.

Can I use these with my existing headlights on?

Absolutely. The integrated switch gives you independent control, so you can run fogs alone or together with headlights depending on road and weather conditions.

Will I need to paint these before installing?

The housings arrive ready to install. If you want to match trim color or customize finish, prep and paint before mounting. Otherwise, bolt them straight in as-is.