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.
Copyright DSMFAQ (Chuck Lavoie) / 1000AAQ (Sean Costall) 1989 - 2021
Site seen by 996070 visitors