Oxygen Sensors Rotor This design uses a core

This design uses a core with almost 50% more columns than the original

Why not upgrade them while performing a necessary repair

Emissions are a close fit and requires minor modifications to the hard tube plumbing at the front and rear

There are kits to convert RX-8’s to use other types of coils but those seem to have limited success too

Oxygen Sensors Rotor This design uses a coreO2 sensors not only go bad, they typically become less reactive long before they fail. The RX 7 does not alert you of an out of tolerance O2 sensor. On 1984 88 models, there is not even a check engine light to tell you that sensors have failed. The consequences of a substandard oxygen sensor are poor fuel economy and a lack of smoothness at cruise. With an RX 8, the check engine light will stay on and may prevent you from passing a smog test. *