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my understanding is that the canbus system is dealing with mostly wheel speed info, so is connected to the abs system, the gauge cluster and the hvac system (ie, speed as it applies to driving the ac compressor). you can use pre-canbus components from a 2000/earlier car, but would have to convert to 3-channel abs. personally, I would keep the oem system in place and just install a parallel system where required - what's what most of the other engine conversions (ie ls, subi, audi) do.
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