it looks like the extended bungs are probably causing too much stress on there. my CNT HFC's dont have this extended bung. the O2 sensor bung is probably 1-2inches long. stuffing steel wool did the trick for me. literally rolling a tightly wound ball and shoving it into the bung, then pushing the O2 sensor in.
im at 30k miles now with these on and so far so good. not trying to defend CNT/ERZ, but then again im in california, no salt or anything to worry about
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