I am trying to think back to when I did this. The downpipe comes off easy from underneath the car. What I can't remember is how bad the O2 housing was since I did it when I put on my stage 3. You might consider dropping the down pipe and pulling the battery and cold air intake crap out of the way and assessing the situation. What I do remember is that one of the nuts holding the O2 housing on is actually welded in place meaning that you loosen the bolt, not the nut. Of course, I can't remember exactly which one, but someone here might...
Not a ton of help, but just to let you know it can be done in a normal garage with normal tools (ratcheting box end wrenches help a lot) by a normal guy.
Z
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'04 Black SRT-4 -- Stage 3
'02 300M Special -- The Business Car
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