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The stock exhaust manifold on the 240 connects to the "Y-pipe" which connects to the cat. A "header" replaces atleast the first 2 and goes from the exhaust ports to a single tube exhaust pipe . So a turbo exhaust manifold would not be a header since it does not carry the gas from the exhaust ports all the way to the exhaust pipe.
Another way to think of it is that the stock manifold is like the "upper half" of a header and the Y-pipe is the "lower half"
A turbo manifold would not have this "lower half"
That is just the way I see it and that probably doesn't mean much. I have never seen a formal definition of a header so thats just my 2 pennies.
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