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Richard Jemison
7,866 Posts

Hopefully, those are a "Modified" set of headers. The original configuration has very poor bifurcation design and in your pics you can see the differences.

Hopefully the metal of the original has been cut away correctly and this isn`t a repair done half-a$$ed, leaving restrictions and metal edges in the flow path.

Commonly the exit from #1 at the initial turn needs modification as well as the curve is too abrupt and commonly crimped..

Pics are of similar headers on the Duetto with both mods to improve flow.


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