bigger plugs, sounds like that thing u ziptie to the fuel line and it boosts fuel mileage by 10 percent, or the "turbo" you put in the intake, anything it takes to make people pay for pointless garbage. Sick with factory plugs unless your boosted ( and i dont think you are ) and then go copper
The best modifications cannot be seen from the outside.
I work on Fords all day so more than likely i know more about your car than you.
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