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  1. #1

    NGK IZFR6K-11 vs IZFR6K-11S

    Hi guys,

    I bought 4 NGK IZFR6K-11 spark plugs for my FD1. I have just realised the recommended spark plugs has a "S" at the end. Can I still use them or I have to get the one with the "S" at the end.


  2. #2
    Member Array
    Join Date
    Oct 2004
    porsche boxster
    the S means "special gasket" as in the crush washer must be slightly different to seal better

    the plug specs are same
    They feature a triple gasket sealing process that virtually eliminates gas leakage past the shell.
    Last edited by EKVTIR-T; 06-01-2015 at 04:27 PM.

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