Spark Plugs

Champion = NGK
N59YD/N59YD = R5672A-10 VERY COLD
N6YC/N61YD = R5672A-9 COLD
N7YC/N63YD = R5672A-8 COOL
N9YC = BP6ES WARMER Stock street hemi/ 340 plug


I just bought a set of the NGK R5672A-9 plugs to try with my turbo. I've had good luck with the RN9YC but want to push boost and timing and want a cold plug.