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Hello everyone I have a 2001 g20t and I havean exhaust leak on the pip before the cat which I can fix with flex pipe. But the one I don't know how to fix is there is a small leak where the o2 sensor goes right out of the manolfold. It's the first o2 sensor. I can tell it the welds cracked or just something with the sensor. It is so small I can't tell. All I can see is smoke leaking out whente car is cold. If anyone has any advice or headers to cat exhaust to sell me for cheap please comment stock or aftermarked it doesn't matter! Thank you
 
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