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Great idea, difficult to implement. If you look at all the non-catted headers out there (TurboWerx, B&B, SuperSprint, the Chinese copies) and compare them to the catted headers from FabSpeed, you'll notice significant design differences to accommodate the cat in the length of the primaries. I don't think there is any way to make room for a cat in any of the manufactured non catted headers.
I have heard that Nello at MaxSpeed will soon have high flow catted headers, but I cannot verify this. Aside from that, I think you'd be designing an building a complete header from the ground up if you wanted to do this.
In terms of performance and avoiding CELs, you can run a non catted header, and relocate the secondary O2 sensors to after the secondary (well now your only) cats.
Hope this helps
Patrick
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