Quote Originally Posted by Z34Phoenix View Post
with boost it is said they do not like the platinum plugs. and i know that even NA they don't like double platinum.
Like 94GrandPrixSE said, it's about the waste-spark engine, not whether or not there's boost. Platinum gets brittle and breaks because it can't handle the abuse. Copper's soft enough not to break off in the engine, but doesn't last very long. Iridium does a great job.