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Just as my title states, I need to know whether or not they will be compatible, ie all the ports match, no blockage of flow, etc... I have been searching online but found nothing. I don't have any head gaskets from each so that I could compare... I have both the a4 and a8 heads but the a4 is garbage. I know that the k24a8 is dbw, and that's why I was wondering if I could use the a4's intake manifold on the a8.
 

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I don't think you can without this...

Actually, that Hasport adapter is not necessary. You would only need to use that if you were using an intake manifold that doesn't have the integrated coolant port (i.e. K20a2).

The k24a4 manifold will bolt to the k24a8 head. They both use the same intake manifold gasket too. If you are using a cable throttle body with the IACV, the k24a4 intake manifold would be the right choice.
 
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