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Without a degree in fluid dynamics, I thinks any of us will struggle somewhat with the theory behind why this stuff works.:)

Rob & Stuart(along with others) have made mention many times that...

I think one of Stuart's posts over in the "development of turbo engines" thread kind of covers this. He made a comment that while the stock manifold looks awful, tons of testing on the dyno showed...

I spent quite a bit of time on 3 & 4 in my manifold. I completely ground out the big knobs that stick out from the roof of the runners. Especially in 3, it creates quite a restriction.

I...