Bosch OEM replacement plugs for the S14 and S38 found in E30 M3, E28 M5, E24 M6. Also used in some BMW motorcycle models.
VAC Tech Tip: We recomend these plugs for many s14 engines up to about 250BHP depending on your fuel used and ignition timing. For max performance street and mild race engines up to about 310BHP, we recomend the Bosch XR4CS plugs below.
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