GTR32: Yes, I know, I have been keeping a close eye on this thread. However, I was hoping for clarrification.
The problem I forsee is: how do you isolate the performance gained from the manifold alone -- which I think most of us are interested in -- from the performance gained from changing turbos, dumps, etc, etc? Those are major modifications in my books. I don't see how you can have a comparable baseline.
As I said, I'm in a position where I need to change the manifolds shortly anyway and would happily voluntier, but like most people I want to change the dumps at the same time which I think would just raise more questions than it answers. People will forever say "oh but he also changed X-Y-Z so that invalidates the result".
Just my 0.02c. Feel free to ignore.
LW.