i'm going to weld in an o2 bung for my wideband. i'm planning to put the bung either in the test pipe or right after it in the exhaust. the bung that i have is flat on both sides. should i carve out one side that will go against the pipe? i don't see any other way to weld a flat bung on a round pipe.
anyone do a similar installation?
anyone do a similar installation?