The data provided is sometimes vague or dated. Even the Nemesis 2.0 for the STI had 3 processors, 2 for most ecu control, and 1 dedicated for drive by wire throttle.
CAN stands for Controller Area Network.
"The automotive industry uses CAN as the in-vehicle network (IVN) for the engine management, the body electronics like door and roof control, air conditioning, and lightning, as well as for the entertainment control. The majority of the European carmakers use CAN-based IVNs. The American and the Far East passenger car manufacturers have also started implementing CAN-based IVNs.
CAN networks used in engine management connect several electronic control units (ECUs). Most of the European automobile manufacturers have also installed CAN high-speed networks (e.g. 500 kbit/s) in their power-engine systems.
In addition, most of the European passenger cars are equipped with CAN-based multiplex systems connecting body electronic ECUs. These multiplex networks link door and roof control units as well as lighting control units and seat control units. They run at lower data-rates, e.g. 125 kbit/s. Many of them use fault-tolerant transceivers compliant with ISO 11898-3. In North America, single-wire CAN networks are also used in body electronics.
In some passenger cars implement a CAN-based diagnostic interface. This interface may be based on the ISO 15765 standard (Diagnostics on CAN) describing physical-layer, transport-layer, application-layer, and how to use the Keyword 2000 diagnostic services.
Another application of CAN-based networks in passenger cars is to connect infotainment devices. There are some proprietary solutions, but also the IDB-C network. The SAE defined the IDB-C application profile in the ITS Data Bus series of specifications (SAE J2366). IDB-C is based on high-speed CAN (29-bit identifiers) with a baud-rate of 250 kbit/s.
The different CAN-based IVNs are connected via gateways. In many system designs, the gateway functionality is implemented in the dashboard. The dashboard itself may equipped with a local CAN network connecting the different displays and instruments." CAN-CIA.org
Many Subarus already have CAN systems in place.
Thanks,
Phil
www.elementtuning.com