Quote:
Originally posted by h22a193
Denso Iridium, thats what they use in Japan, me to
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NGK is oem, I'm sure that's what they use.
As far as using an H23 plug or F22 plug in an H22. They are the same plug except for heat range. Use a ZFR5-F11 in a car that needs ZFR6-F11s and it will burn up the plug. If you do the opposite then it may foul if the engine doesn't get hot enough. If you have nitrous, FI, or hot climate this is suggested.