Visiting from the E24 page. I'm in the process of putting a turbo on my 635csi. I have a Dinan manifold off a 633 which places the turbo near the #6 cylinder. I seem to recall the 745i manifold placing it more toward the #4 cylinder. This would make the plumbing much easier to deal with. Is there a source for a manifold and also will it bolt up to the 635 head. The plan is to run the waste gate at 5 or so psi but install a Saab APC unit on it to manage the boost. Thanks for any help/insight.