Originally Posted by heeman10

I don't know where your first manifold is The pipes overhang the edges of the collector, which is why I say it looks too small. Wouldn't it be better if the collector edges and the pipe edges all met, and THEN reduced in cross-sectional area? The way it is at the moment would cause a load of turbulent flow as the gas flow meets the sudden edge of the collector. Not necessarily picking at your work, just wondering what your thoughts are. I couldn't make one