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This may be a stupid question, and perhaps someone can point me to some elementary material on this subject, but what is the difference between a Bosch +4 and a +2 (2$ difference at autozone). The splitfire 3 platinums are ~20 dollars for one plug -- that is a huge difference from the +4's, which are about 6 dollars each. What gives? (1996 4cyl ranger @ autozone.com...)
Sorry for the ignorance. Thanks for the help.
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