Yeah running the car without the proper gaskets is bad news, that can cause warping and all sort of fun problems, contact the company that made your header about gaskets, see if they can give you some part numbers. Which gasket didn't you put on? The one that goes to the head or the downpipe? And also, just buy a new o2 sensor, your probably gonna wreck it if it needs that much force. Also, are you running your car without the o2 sensor?
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