Quote:
Originally Posted by Lantanafrs2
There were several companies designing manifolds when these cars came out. Crawford was one of them. They found gains through additional runner length hence the power blocks. It's going to be hard to beat subaru's modeling software on this one.
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Adding to this. The BPBs represent a solution with different optimization parameters (peak output at lower rpm), rather than a more optimal solution to the same problem. The former is what the aftermarket does well, but the latter is firmly in the OEM wheelhouse.
Back to the original topic, it seems the OP is trying to out-optimize the OEM. That's probably not going to happen as there isn't much left on the table. Instead, it might be better to define the difference in the problem parameters so that you are optimizing to a different target, like the Crawford BPBs.
Alternatively, throw out all the OEM design decisions and start from scratch, modeling the physical effect you want then finding ways to make it happen. That's pretty damn expensive and risky though.