comtemplating a new motor, options inside :x

[Nd4SpdSe]

What about using the K8 manifold. Compare them together. I'm pretty sure the KFDE has the same IM as the K8, but the KFZE is straight neck. However, if the ports on the bottom match up, you can use the K8 manifold no problem IMO. As long as the ports match up and are of the same size and shape, it should be fine. You don't want to fit any IM that doesn't match up, otherwise you will have restricted flow or possible air leaks.

That's not necessarilly true, Probe/Mx-6 guys put square ZE IM's on their motors for a few HP gain.

I don't know about the KF idea man, especially if you want reliable.