I went iridium since I'm leaving the engine stock and the only thing I may do in the future is add a downpipe when the cat plugs up. I was recommended 605 copper but decided against since they wear out so fast. Headlights and taillights are on the todo list as well as either getting the hail dents out of the hood or replacing it. Any idea who sells plate fillers? I checked ebay but no silver.