Following my recent RR visit the tester seemed to think that i needed colder plugs.
I have NGK Gold BCP7EV Plugs fitted at the moment (a result of EDS phase 1) - i am now running Phase 3.5,but having looked at various manufacturers part codes i am a little baffled!
So what do people suggest? having searched the MIG depths i think the following seems to be a good blend
iridium core (lifespan)
grade 8 coldness
personal preference of NGK but am open minded!