Description

The Racing Plug AR33 is engineered for high-RPM applications where spark energy and combustion efficiency directly impact power delivery and throttle response. Whether you’re fine-tuning a custom build or replacing worn plugs in a race engine, this non-resistor design eliminates capacitive losses for maximum spark intensity. The tapered seat and optimized 0.460-inch reach ensure consistent ignition timing across wide operating ranges—critical for forced induction and high-compression builds.