I was skeptical at first but a friend came along and we used one on his exhaust to install broadband and after that I was sold. Instead of taking my test tube off and taking it to weld the connector on, I was able to buy a step drill and drill a hole, install it, and then install the O2 sensor for the broadband sensor. I've had it for about 3 months, no leaks or any issues. If you don't want to or can't fit a weld plug, this is the way to go.
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