Now is when it gets complicated.
I run the #4 tube from the collector to back alongside the #2 tube. I do not connect it to the flange at this time. The reason for running the #4 tube back to there is so that I know where to locate the upper bend in the #3 tube to go over it.
I make the collector ends to the #6 and #7 tubes so that I can see where the #3 tube has to be routed to clear them. Remember the LH cyl bank will be the upper set of tubes.
I then finish the #3 tube
Lastly for this side I run the #4 tube the rest of the way to the flange.
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