A Stage 2 features all the modification of a State 1 plus the fuel metering circuits are inspected, blueprinted and then calibrated to match any modifications done to the engine such as intake manifold, headers, ignition or cam change, and intended use of the vehicle, the air horn is milled to improve and equalize airflow between the primaries and secondary. Electric choke and four corner idle circuit are optional on all Stage 2 carburetors.