Nexus S3 Plug ‘n’ Play Adapter Harness Kit – Subaru WRX MY99-00

The Ultimate Nexus S3 Package for MY99-00 WRX

The Nexus S3 Plug ‘n’ Play Adapter Kit for Subaru WRX MY99-00 represents the highest level of engine management available for the GC8 platform. This kit combines the flagship Haltech Nexus S3 VCU with the specific adapter harness, offering unparalleled processing power, data logging, and expansion capabilities.

Engineering Deep-Dive: S3 vs S2

While the S2 is powerful, the Nexus S3 offers more I/O and advanced features suitable for serious motorsport builds. It includes oscilloscope functionality for sensor diagnosis, more high-current outputs, and additional analog inputs. This is the choice for builds targeting high horsepower where monitoring every parameter—fuel pressure, oil pressure, exhaust backpressure—is critical. The adapter harness ensures that the core engine functions (ignition, injection) are handled seamlessly through the factory loom.

Operational Benefits: Complete Domination

The S3’s capabilities allow for complex traction control strategies, 4D boost control, and extensive data analysis. The onboard wideband controller ensures precise tuning of the EJ20 engine, which is notoriously sensitive to lean conditions. This kit provides the confidence to push the engine to its limits.

Fitment and Application Scope

Suits:

• Subaru WRX: MY99-00 (GC8).
• Transmission: Manual Transmission Only.

Technical Specifications

Summary & Includes

The HT-213305 Kit is for the GC8 owner who demands the absolute best.

Includes:

• 1 x Haltech Nexus S3 VCU
• 1 x Plug ‘n’ Play Adaptor Harness
• 1 x M14 x 1.5 Air Temp Sensor
• 1 x Auxiliary I/O Plug & Pins