I believe McCoy makes the Hangar 9 plugs... I have noticed that the H9 "Super Plug" that comes installed in the Evo 2 strokes looks just like a 4 stroke plug. I have a feeling that it's probably the McCoy 4 stroke plug? That would figure, right? The Evo seems to like a hotter plug, and the long reach works well in the Evo head that has an angled plug hole.