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Project Subaru Sti Passage

Perrins' O2 emulator sends the ECU a signal to make it think that its rear O2 sensor is sensing the presence of a cat.
Project Subaru STI Part 6

 Perrins' O2 emulator sends the ECU a signal to make it think that its rear O2 sensor is sensing the presence of a cat.  View Related Article

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