Just a quick note on the question of which spark plug is correct. The reason for some of the confusion is due to the advances in plug technology that allow a given plug to cover a wider heat range. That is why you see some plugs, like the champion heat range 7, becoming hard to find or out of production. Champion 9's cover a lot of heat ranges that used require a lot of different plugs. Same for the same heat range called out for the turbo and the non-turbo. Nowdays one plug can cover them both. The days of "hot plugs" and "cold plugs" is pretty much history unless you're into some EXTREME applications.
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