This review is from: 4 New DENSO Iridium Spark Plugs IK22 # 5310
I know that a spark plug in most cases do not increase the power of an engine... What I have learned about the small displacement ECU controlled multi valve engines is that a colder heat range with smaller electrode spark plug is going to allow the ECU to add more ignition advance and the lesser amount of electrode projection is going to allow better intake flow into the combustion chamber.... Before and after dyno runs by Oscar Jackson of Jackson Racing and KraftWerks Superchargers has proven this to be true on Honda Fits using this same IK22 Denso spark plug.
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