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The runners are very short 2” in length and expand from oval to round rather quickly and most likely would not change the air flow characteristics very much. If you look at the intake manifold for exotic engine development – exoticengine.net, the are using the same principle/philosphy with their runners although I’m not sure how long they are. I made my runners as short as they will be in order for the bolt to go through. Either that or use studs with lock washers. My project cost me less than what those guys are charging for aluminum sheets and furthermore, I have complete control over what specifications I want done. Long weekly conversations with the engineers that I spoke to gave me good advice according to different theories and formulas but actual testing is a different story. You can bend aluminum sheet but can mold it. Machining aluminum is so much softer and does not require going through tons of bits like stainless, mild steel, etc. The bottom piece used up 2 bits.
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