ZFR6F-11 --> ZFR7G-11 (Nitrous & H22 Related)
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ZFR6F-11 --> ZFR7G-11 (Nitrous & H22 Related)
Is that the correct step up for the NGK copper plugs.(1 step colder) 50-75 dry shot? I looked through the NGK catalogue @ work, the the website, but it seems itd be a ZFR7F-11, yet Im not seeing anything. What do the prelude/nitrous guys use as far as plugs go?
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