I believe you can only plug it in to one of the sensors anyway. I think it's the blue plug that's the o2 sensor. The plugs should only be able to fit inside the correct wireharness. You don't have a picture do you?
if the pipe broke when removing the cat to install your race header, then you werent doin it right and twisted the egr pipe til it broke. =new egr pipe.
if the bung on the header for the egr broke, either get it warrantied (if applicable) or have it welded back on (not a big deal).
cheater goes on the 2nd (lower) o2, NEVER the 1st.
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