The RPM killed the Asymmetric head, teams chose not to pursue the symmetrical port head when it was released because the asymmetric head made more power. With the intro of EFI and the RPM limit the symmetrical port head is a better design. But since no one was developing that platform they fell behind. They were making strides with it and given a bit more time I am quite sure they would be right there again. Kramer stayed with the asymmetrical stuff as that's what they had their time and money tied up in. No different than how those changes affected the DRCE2 stuff. It was hurt by the ROM limit but the DRCE3 was superior. Team KB was on the development of the 3 head way before anyone else which is why they had such a quick start. To oversimplify it