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Maybe the previous owner ground out / blended the weld? As it doesn't appear to be the shiny stainless steel of a Gen 2 header.
Show us the heat shield & aft half of that pipe.
 

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Discussion Starter · #3 ·
There are no mounts for heat shield and it is rusty so must not be stainless steel. The throat is tapering in on the wide side and it is smooth and symmetric, seems like a factory job.

Hood Sleeve Gas Bumper Elbow
 

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Looks like an old 'big gun' brand header. They used a ceramic coating VS a heat shield.

Once the coating was sand blasted from riding the mild steel tubing would start to rust. Pretty typical for those.

You'll save some weight over the welded gen1 header but unlikely to outperform by much. Building 'performance' is much more comprehensive.

Pic of gen2 stainless head pipe.
Pliers Wood Tool Household hardware Bicycle part
 
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