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Old 07-11-2014, 02:13 AM
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Has anyone tried the ZEX power tune plugs on the 4.6 and what was your verdict good or bad
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Old 07-11-2014, 02:14 AM
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In my past experience, Motorcraft and only Motorcraft in stock/ish trucks. If blown or juicing that's a difference story.

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Old 07-11-2014, 09:53 AM
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The Motorcraft SP-515 is still the current part correct?
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Old 07-11-2014, 10:14 AM
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SP515 for the 5.4l, yes. SP514 for the 4.6l.
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Old 07-11-2014, 01:22 PM
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I read these zex plugs are good for bolt on performance parts they also make a different plug for boosted and juiced engines
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Old 07-11-2014, 03:39 PM
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Originally Posted by LaMartian
SP515 for the 5.4l, yes. SP514 for the 4.6l.
Thanks for the confirmation. The only reason I asked was because all of the parts store web sites say they do not fit
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Old 06-21-2015, 09:27 AM
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Has anyone changed out the sp-515 plugs without any issues
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