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NISMO Iridium Spark Plugs 22401-RN010-6 (Spark Plugs) | Check car compatibility | |
Produces much more complete combustion, delivering more power and response. Thermo edge at the top of the insulator limits the deposition of carbon, which otherwise can reduce firign performance and cause poor idling. Made by NGK. |
NISMO Racing Spark Plug 22401-RS238-7 (Spark Plugs) | Check car compatibility | |
Used in N1 racing. Better ignition performance and reduced electric discharge voltages. Made by NGK. |