If you do a search, you will find some quick notes I wrote up about what you need to do. You don't have to cut your harness at all if you have the correct harness. There's a step that talks about hooking up the rear tail lights so they come on with the fog lights. That step "might" require you to cut but the rest shouldn't. Depends on the harness you have in there. I didn't have to drill a hole either, there was one already there