Subaru Harness Merging - iWire Subaru Wiring Services Subaru made it bolt right up, iWire makes it plug right in. Leave the Subaru Wiring headaches to us and focus on the mechanical aspects of your Subaru swap. 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.