regaurdless of what everyone else says, you can use a 91-94 Sentra Se-r O2 sensor. using one on my aftermarket j-pipe, car runs perfectly fine, no SES/check engine light. The Se-r sensor is a 3 wire plug that clips right in to the stock plug. i paid like $61 for a new one from autozone.
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1990 Nissan 240sx:s13 blacktop, s13.5 front
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