It's my understanding that the OEM M5 plugs do not lose electrodes when used on track days while it's fairly widely known that some other premium plugs DO lose electrodes when substituted in BMW apps. I surely can't say which other one's don't lose electrodes. My investigation has largely focused on 540i apps & my experience is limited to BMW OEM plug. The Pulstar plug may be stable and durable under 30 minute cycle race conditions, but who's to know for sure....I personally would not experiment.Thanks for that insight. I'll look into some different plugs for my track days. Any brand suggestions?