There is a great guide written here by MrBoxx of DSMTuners:
You want to go with the non projected type plugs like BR6ES, BR7ES, BR8ES.
BR6ES = Stock to 20psi
BR7ES = 20psi to 30psi
BR8ES = 30+psi
Non projected plugs help fight against spark blow out in high boost applications.
If plug fouling occurs, go one step hotter and monitor performance and results.
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