So i cant seem to find a solid answer as to which ones should be used for 350-450hp.
ZFR5FIX-11
^ i know thats the stock iridium spark plug BUT if i type in ZFR6FIX-11 i can find those but since im trying to aim for 400-450hp i thought 2 steps colder would be best. and i cant find a ZFR7FIX-11.
is there any recommendations as to which ones to run?
ZFR5FIX-11
^ i know thats the stock iridium spark plug BUT if i type in ZFR6FIX-11 i can find those but since im trying to aim for 400-450hp i thought 2 steps colder would be best. and i cant find a ZFR7FIX-11.
is there any recommendations as to which ones to run?
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