a spark plug, to fire the combustion charge. The plug should not foul or contribute to detonation. NGK meets those needs. NGK is one of the top spark plug manufacters in the world. Even the domestic high performance engine builders use NGK. They don't use POS champion plugs. I am still waiting to hear how Denso is going to be better than NGK? You don't gain big HP gain from a spark plug. Don't compare spark plugs to tires and rims where there is an obvious performance advantage and looks appeal to upgrading. What performance advantage is Denso going to have over the NGK platinum or copper plugs?
