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Dominator EFI Auxiliary Harness - 558-401 exhaust-systems Single-Stage Power Valve High FlowOverview: Used when adding a second wide band oxygen sensor to a Dominator EFI installation. Features: J2A Connector #2 Wide band oxygen sensor harness (Fully Terminated) 23 user programmable input wires with pre crimped ECU pins Application: Year Make Model Submodel Engine Size Universal Specs: Brand Holley EFI Emission Code 3 Harness Type Auxiliary Product Type J2 Auxiliary Input Output Harness Connector