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Are you stating actual real world proof or just repeating some public claims?

he may be pertaining to their propogander...i mean TV adds where they show Tundras headers and a competitors cast iron exhaust manifold.....( whos we dont rightfully know, but the Tundras headers are a work of art )

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he may be pertaining to their propogander...i mean TV adds where they show Tundras headers and a competitors cast iron exhaust manifold.....( whos we dont rightfully know, but the Tundras headers are a work of art )

 

And if they're like the Tundra 4.7Ls when they get a little age they will crack at the head flange or if you try to remove the sensors the threads will come right out with them. They're kind of expensive too, but the dealers all stock them because there is a need.

 

Cast iron is more durable, less expensive, quieter and retains heat better for lower emissions. If designed properly a good iron manifold will flow as well as a short tubular manifold. Note the shape of the '04 and up F150 manifolds:

15_43vext.jpg

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