When you increase the boost, it creates more heat in the combustion chamber. Different heat range plugs help to regulate the cylinder temps to help fight pre-ignition. There's many people on here that bitch about timing pull, so trying different plugs may help with their issue.. maybe next time do a little research before making smartass comments. addle:
:word:Exactly what I wanted to say but i'm at work and shouldnt be on golfmkv:biggrin: