The RPM responded very well to porting which is a plus. I opened it up but left it a bit smaller than the MR G 202 or Fel Pro 1247 MR size to match a set of TFS heads, and it picked up 77 cfm average flow. It now flows 377 cfm which should be nearly perfect for a TFS head on a street and strip style engine. If I were to port the manifold to the CJ size ports, then it would be near 390 cfm average. It was easier to pick the flow up than the offshore manifold. There are subtle differences, but it is a "copy" of the RPM. Joe-JDC
