iWire - Subaru Harness Merging - Subaru Wiring Harnesses Subaru Harness Merging "Subaru made it bolt right up, iWire makes it plug right in." You'll send us the body wiring harnesses from your car and the car that matches the engine you plan to use. EngineWiring We offer an alternative to expensive aftermarket engine management systems. We re-wire your factory engine wiring harness to allow you to install the factory computer and engine wiring harness in your project vehicle. Now you can have the Fuel Injected engine swap of your choice up and running at a fraction of the cost.