i'm assuming it's an eg, so obd1
looks like they might be using the sir ecu with the type r motor if your crossover is indeed 4500rpm
98spec dc2r's were obd2a afaik so they couldn't use the original p73 ecu without a harness
anyone want to confirm whether 96spec dc2r's used obd1 or obd2a?
looking at the second last photo, on the head there appears to be a 98 so the head's at least a 98 afaik
edit; nevermind tiny photo so i'm wrong
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