NGK manufacture an extremely high quality spark plug product. Part number BR8ES is no exception.
We have classified part number BR8ES as "RACE" type, more specifically BR8ES features Standard construction as well as the same high quality copper core as the rest of the NGK sparkplug range.
The BR8ES has a non-protruding tip and is perfect for EVOs 4-8 running over 400hp.
We have run these at well over 600hp with no issues whatsoever.