I Don't Think Its Gonna Improve Top End Power....It Just Makes Spark Strong....Making Combustion More Efficient..
Not Like Increase So Much High End Power.....Thing Is That You Use And Then Heat Range Differs...Then It All Goes Opposite And It Get Worse As Heat Range Won't Match....!
Well Factory NGK # Is "NGK BP-5ES" or "Denso W16EP-U"
or "Bosch W8DC"......
In Denso Can Also Use Resistance Plug..."Denso W16EPR-U"
Regards