Nexus S2/S3 Plug n Play Adapter Harness - Subaru WRX MY99-00

The Haltech Nexus S2/S3 Plug n Play Adapter Harness streamlines ECU installations on 1999-2000 model year Subaru WRX vehicles. This application-specific harness connects directly between the factory wiring and Nexus S2 or S3 ECU, removing the need for cutting or splicing original looms. Designed for professional workshops requiring reliable, repeatable installations, it maintains all factory connector compatibility while enabling full engine management control. Ideal for dealers performing multiple conversions where installation speed and factory-grade finish are essential to profitability.