That looks like it was arcing across to somewhere at those burnt points. I know my coil housing was leaking somewhere when I would give it gas under load, we changed the plugs boots and housing and everything was good. These housing are crappy, they are not real good insulators, when a plug starts going bad it will leak spark to somewhere easier or under load, check out this guys thread, he had problems with the housing. Internal link at this forum--->
http://www.aleromod.com/forums/showt...d=1#post426397