I got the coils & wires. The only thing I noticed was the red wires matched my gas tank. I also run irdium plugs. I don't thing any of these are needed. The stock items were just as good. Ran as good. But hey, I had some money I hadn't spent yet. Maybe they will last longer. Maybe not. If you had high compression & other high performance mods done they may come in handy. I say do it. Your going to spend the money somewhere. After 41,000 miles I haven't had any trouble with them. Built good I guess. I was only worried that the coils pulled more current & might take the computer out but everything is okay.