E3 Spark Plugs.....Anyone Tried Them 5.4L?
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Im 41 and have been modding cars and trucks since I was 16. I was always told stick with what the car comes with, the manufactor did all the testing for you. On a few mustangs and TA`s I strayed and learned stock plugs were best. The other brands worked good in the beginning but didnt last long at all.