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Old 02-01-2016, 10:55 PM   #6
SoCoC10
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Join Date: Nov 2014
Location: Colorado
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Re: Yet Another Spark Plug Question

I always recommend running factory plugs in your engine. Motorcraft in Ford, Champion in Mopars and Delco in GM. Lots of engineering goes into this plug. Heat range, materials etc. I agree only way a spark plug like the E3s or Splitfires will give any noticeable power gains would be in a high horsepower engines.
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