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^^^ I have no idea...this is all I could come up with...
"Platinum spark plugs come in two varieties - single and double platinum. A single platinum plug is much like a copper spark plug with a platinum disc welded to the center electrode; a double platinum spark plug has a platinum disc on both the center and side electrodes."
(Seems like little to justify a $13 dollar bump.)
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78 SC Targa Black....gone
84 Carrera Targa White
98 Honda Prelude
22 Honda Civic SI
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