Which ECU, o2 sensor needed???

[B16aRS]

Stock GSR auto, when have you been to japan cause thats the only place GSR was made auto. If you have seen one in the US it wouldnt be stock. It would be a GSR motor swapped into an auto LS or RS. Therefore it would not be stock. To do that you would have to get the auto ECU from Japan which is kind of rare.