I have a turbo and I was talking to my friend the other day (he has a turbo prelude) that spark plugs should be replaced for better performance after a turbo. He said usually you just put one number colder. Does S2000 have 8? So should I be looking for a number 7? (I'm pushing 7psi/0.5bar boost) Which company makes the best sparks? anyone have new sparks in their S?

Tuner