Ford Focus Forum, Ford Focus ST Forum - View Single Post - who here is succesfully running al 103's?
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Old 03-08-2013, 10:08 PM   #10
wickedgreyzx3
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I was the one who originally got the idea going after reading it somewhere else, best efficiency from coldest plug without fouling.

I run A103s gapped at .055". I change every 20-30k.

Someone did a dyno and going from a factory gap 104 to a wide gap 103 did make 5 horse power.
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