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They are the same as the EL GT headers.
They have a 2 bolt flange that bolts onto the cats.
I have heard that the E series cats are not as good as the AU cats.
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the el gt headers were stainless steel and ceramic coated, they are quite good headers, why replace them?
as far as cats go just oversize the inlet and outlet pipes, as this is all that high flow cats really are, all the catylist in aus come from on company and therfore are all the same, so all you can do to get better flow is to make the inlets and oulets flow better.
no point waisting $$$$ unless they are blocked, then you have no other option but to buy a new set.