AMP Subaru WRX Plug-and-Play ECU (02-05)

Standalone Engine Management Without Rewiring

When you’re building a Subaru WRX, the ECU needs to provide precise control for boost, fueling, and ignition — without adding installation complexity.

The Subaru WRX Plug-and-Play (PNP) ECU is a true standalone engine management system designed to replace the factory ECU and plug directly into the original Subaru ECU connector and factory wiring harness — no cutting, splicing, repinning, or adapter harnesses required.

It’s built for serious WRX builds used in road racing, rally, track days, and performance street applications, while keeping installation clean, OEM-style, and reversible.

✅ True plug-and-play factory ECU replacement
✅ Uses the stock harness and factory connectors
✅ Designed for turbocharged Subaru WRX performance builds
✅ Built for road racing, rally, and sustained high-load operation
✅ Made in the USA + real in-house tech support (20 years)

True Plug-and-Play Installation (What Sets It Apart)

Many standalone ECUs require wiring changes, patch looms, or harness replacement. The Subaru WRX Plug-and-Play ECU is engineered differently — as a factory-connector standalone ECU built specifically for the WRX platform.

What “True Plug-and-Play” Means

  • Unplug the factory Subaru WRX ECU

  • Plug in the AMP ECU using the factory connector

  • Retain the original engine wiring harness

  • No adapter harnesses

  • No repinning

  • No cutting or splicing

You get full standalone control without turning your WRX into a wiring project.

Installation Overview

Installation is straightforward and keeps the factory wiring layout intact.

Basic installation process:

  • Remove the factory Subaru WRX ECU

  • Plug in the Subaru WRX Plug-and-Play ECU

  • Connect your laptop and verify communication
  • Start the engine and begin tuning

Because the wiring stays untouched, installation time is reduced and long-term reliability is improved.

Built for Turbocharged Subaru WRX Performance Builds

This ECU is designed specifically for turbocharged Subaru WRX engines where precise control and reliability are critical.

Common supported setups include:

  • Increased boost pressure

  • Upgraded turbochargers

  • Built short blocks and long blocks

  • Intake and airflow upgrades

  • Fuel system upgrades

  • High-output forced-induction builds

Whether tuning is handled by the owner, a local Subaru performance shop, or a remote tuner, the ECU provides the control required for serious WRX applications.

Road Racing and Rally Control Features

Subaru WRXs are heavily used in road racing, rally, time attack, and track-day environments, and this ECU is designed with those demands in mind.

The Subaru WRX Plug-and-Play ECU supports control strategies focused on:

  • Stable fuel and ignition control under sustained load

  • Consistent performance during long track sessions

  • Smooth throttle response for corner exit and low-traction conditions

  • Engine protection strategies for aggressive driving environments

  • Reliable operation in varying traction and surface conditions

These capabilities are critical for both circuit racing and rally-style driving, where predictability and durability matter as much as power.

Factory Harness and Sensors — With Standalone Control

The Subaru WRX Plug-and-Play ECU is designed around what WRX owners value most: modern control without unnecessary wiring changes.

  • Retains factory wiring layout

  • Uses original Subaru ECU connectors

  • Works with factory sensors

  • Preloaded base configuration for startup

  • Full tuning and datalogging via TunerStudio

You get the benefits of a modern standalone ECU while keeping the simplicity and serviceability of the factory system.

Designed to Grow With Your Build

As your Subaru WRX evolves, the ECU is designed to grow with it.

Through its expansion capability, the platform can support upgrades such as:

  • Additional engine and pressure sensors

  • Advanced boost control strategies

  • Engine protection features

  • Track and rally-focused datalogging and analysis

This future-proof design allows you to expand beyond a factory-style configuration without replacing the ECU.

Compatibility Overview

The Subaru WRX Plug-and-Play ECU is offered in one dedicated configuration, purpose-built for supported Subaru WRX platforms.

Subaru WRX Plug-and-Play ECU Compatibility

Vehicle Model Years Engine Transmission Plug-and-Play ECU
Subaru Impreza WRX (USDM) 2002–2005 EJ205 2.0L Turbo Manual View Subaru WRX Plug-and-Play ECU →

Important Compatibility Notes

  • 2002–2005 USDM Subaru Impreza WRX STI — Not Compatible

  • Non-USDM WRX EJ205 platforms — Not Compatible

This ECU is designed specifically for supported Subaru WRX applications and is not a universal or multi-platform unit.

Why Subaru WRX Owners Choose AMP

Subaru WRX owners choose AMP when they want standalone control without added complexity.

Universal ECUs often require rewiring or patch looms. The Subaru WRX Plug-and-Play ECU delivers modern engine management while keeping installation clean, reliable, and platform-specific.

  • Factory-connector installation

  • No harness replacement

  • No unnecessary wiring changes

  • Track- and rally-proven

  • Made in the USA with in-house support

What’s Included

Everything needed to install and begin tuning is included.

  • AMP Subaru WRX Plug-and-Play ECU

  • Base configuration for startup

  • TunerStudio tuning and datalogging compatibility

  • Setup documentation

  • In-house technical support from live technicians

Frequently Asked Questions

Is this a true plug-and-play ECU for Subaru WRX platforms?
Yes. It replaces the factory ECU and connects directly to the original Subaru wiring harness with no wiring modifications.

Do I need an adapter harness or wiring modifications?
No. The ECU plugs directly into the factory connectors.

Is this ECU suitable for road racing and rally use?
Yes. It’s commonly used in road racing, track-day, and rally-style WRX builds where durability and control are critical.

Is this suitable for higher boost and built engines?
Yes. The ECU is designed for turbocharged and high-power WRX applications.

Can this ECU be tuned by a shop or remote tuner?
Yes. Both local Subaru performance shops and remote tuners are fully supported.

Standalone Control Without Turning Your Subaru WRX Into a Wiring Project

If you’re building a Subaru WRX for real performance — on track, on stage, or on the street — the ECU should support your goals without adding unnecessary complexity.

Built for boost. Built for control. Built for serious Subaru WRX performance.

View the Subaru WRX Plug-and-Play ECU →