Gylezy love your mani but can I suggest a lil improvement?
The 1st and 4th pipes will cause the pulses to be forced
back up each other unless there is a separator or they are
welded onto the 2nd and 3rd pipes only. So youll have just
the 2nd 3rd into exiting into the turbo flange and the others
using part of the 2nd and 3rd endings. Almost like two Y into 1.
Also the angle could be improved by moving the turbo flange out
a little or angling the pipes towards the flange, hope my
image and engrish makes sense.

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  manifold_9.jpg (58.89 KB)