Focus Fanatics - View Single Post - Autolite 103 installed.
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Old 06-19-2012, 05:52 PM   #24
Focus Enthusiast
Join Date: Feb 2011
Fan#: 83143
Location: Quincy, IL
What I Drive: 2005 white se zx4

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103's are one step colder for turbo or high performance engines,but work fine in a stock engine. 104's are for stock engines. I went with 104's because the store didn't have 103's in stock. I have noticed the same performance gains as those running 103's.
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