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.