I don't have any personal experience with the OCP. I have read where people have had good luck with it. I have run the Prefix and Eddy dual four with good results. However, the Eddy dual four has port shaped for the early heads(03-08). There would be slight reshape involved to fit the Eagle/Apache port. The Prefix has the port window for the Eagle/Apache. My 426 stroker 6.1 has the tall Ritter. That REALLY works.