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Yes there is an O2 sensor in the real catalytic convertor on an S14. The one that is where a catback exhaust system hooks up to is not a real cat, rather just one there for looks I guess. I've heard it was put in for visual emissions inspections, but that could just be rumor. Either way, the fake cat has nothing much in it at all anyways. You're real cat is right off the header, and has an O2 sensor. So you either have to get a Random Tech cat (I don't know the part #), or just get a Hotshot header (full header, unlike Greddy SS short header) and replace the fake cat with a real universal RT, or Carsound cat or something. That's if you're worried about emissions. It'd probably sound better with a cat on there too. But if you don't want to, just weld a pipe in where your fake cat is with the Hotshot header and that's the freeist flowing exhaust you can get.
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