I started using these plugs after I saw Chip and Ash using them with no probs. They are a tad shorter than stock plugs. They are great plugs since they are cheap compared to the platinums and only a tad shorter. The copper plugs don't last as long but who here changes plugs every 60k? People also say that copper plugs will save you from detonation since the plugs will give out before you do any damage but I'm not too sure about that. You might want to email Chip for more info.