If you're using Platinum or even worse Iridium core plugs, you will get problems with hi-boost turbo'd engined. I think its amazing how some people vendor these plugs to cars like this.

Coppper core plugs are the way to go, cheaper and manage heat transfer far better than any other metal, it just needs more regular changes than Plat/Iridiums do, but that's not a problem since copper plugs are so cheap.