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You can pick up a set of coated Pace-setters with a Y-pipe through summit for a pretty good deal. It wouldn't hurt to at least price shopping. I had the same problem when i was doing headers I tried to salvage the 02 sensors but they wouldn't budge so I ended up buying new OEM GM ones and they work great.
I have a can of PB Blaster if you want to try that.
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