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I don't believe they require indexing at all. I've replaced ours twice with the Bosch #FR7LDC4 plugs (the ones the dealer carries) and never had any problems at all.
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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