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Leaving Skid Marks
NGK plat plugs stock leads, ordered new leads but guy ordered 4g63 instead the day i was doing the plug change so missed out this time. 7 heat range is wat SKR advised and said plat was good enough and i am running 17psi and safe tune of 175kw power band is between 3000rpms and 5000rpms and runs a dreams no dramas so far. Changing coil packs soon, How much am i looking at and wat option do i have??