Exhaust Manifold flange down pipe surprise!

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Burban22

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Was that the local pick and pull. Grabbed these manifold pipes for my LS swap. Have never seen these before. Is it some kind of emissions packing? Was off an early 2000s Tahoe. I guess I’ll hammer this stuff out.

Going to make my own 2 1/2 inch y pipe into 3” single exhaust. No cats. Should breathe just fine for my stock L59 5.3.
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