Download the Haltech Quick Start Guide for this Product Here Effortlessly upgrade your Subaru WRX's ECU with the Haltech Elite 1000/1500 Plug n Play Adaptor Harness. This harness provides a straightforward connection between your factory harness and Haltech ECU, ensuring a quick and easy installation process. Key Features: Plug and Play: Easily connect your Haltech ECU to the factory harness without extensive rewiring. Quick Installation: Get up and running in just a few hours with the provided quick start guide. Performance Tuning: Fully programmable systems allow precise control over fuel delivery and ignition timing, maximizing engine performance. Overview: The Haltech Plug'n'Play Adaptor Kit is designed to replace your factory ECU with a Haltech Elite ECU. This upgrade facilitates virtually limitless performance modification and tuning, allowing you to extract maximum performance from your engine under all operating conditions. Compatibility: Suits: Plug 'n' Play replacement of the factory ECU for: Subaru WRX MY99-00 (Australian Delivered and JDM) Manual transmission only Includes: Injection Molded Plastic Plug 'n' Play Adaptor Harness M14 x 1.5 Air Temp Sensor with Matching Plug and Pins Auxiliary I/O 16 Pin Tyco Plug and Pins Installation Support: Quick Start Guide: Walks you through the installation process. Full ECU Manual and Software: Located on the CD or USB key provided with the ECU for detailed installation and configuration guidance.