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I was drilling my installed exhaust to weld in the O2 bung for the FITech, I used a step drill bit and drilled completely through the other side...had to take the whole exhaust off to fix:-[
I did this too. Right in front of the car owner. Felt so dumb. I ground the edges of the bung and weld until it was free. Once I cleaned it up and moved the flange I welded it again. It was just a little shorter. I had blocked it out until your pick gave me a flash back.