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  1. Do these use spark plugs say anything about my engine?

    This was the front passenger side. The back plugs seemed to be less dirty. Sorry no other pictures just this one. This plug seemed to be the dirtiest.

  2. Do these use spark plugs say anything about my engine?

    I have a ford performance tune. I wonder if I need to upgrade the air intake to help it breath better.

  3. Do these use spark plugs say anything about my engine?

    Do these spark plugs look normal after 70k miles? Just want to see if there is anything wrong I should be aware of. Note that one of the plugs in the picture is the brand new one.





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