NGK Racing Spark Plug - B9EG The version you use is

The version you use is a silicon alloy that is equally balanced to insure your total safety in the extreme conditions of the competition

The TWINAIR Power Flow kit has an aluminium cage offering maximum sealing and stiffens the filter

ProX Steel Plate Set Features:

• Made from 7075 aerospace aluminum construction

Sublimated

NGK Racing Spark Plug - B9EG The version you use isThe Racing Spark Plug intended for competition should be able to resist to extreme conditions: Repeated acceleration and deceleration with power Intensive engine operating at high rev. Extreme condition inside combustion chamber such as temperature variation, pressure, vibration and turbulences cannot be sustained by a standard spark plug.