I was on www.rockauto.com and they have "exhaust pipe welded assembly" listed for $27. I'm not sure, but that might be it. They have another listing for resonator which comes with the pipe AND a resonator already welded. Your best bet would be to call them and ask about the other part. It's:
AP EXHAUST Part # 18169
Center Pipe; Standard W.B.;OE system was a welded assembly
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