Tri-Y up top is very nice, but i would hope to move the design to be the dual-pair output, like old SD cast aluminum did. see a second part can take the pair to a universal/STD collector, or a equal-pulse header cross-pipe collector.
2:1 merged collector into 3" or 3.5" STd Collector flange.
And the opportunity to cross 1-pipe over to the other side for even-pulse (pulsetrain ) timing.
Such that the 2-4 goes straight to RH Collector. 6-8 crosses over to LH Collector.
And 1-5 goes straight to LH collector. 3-7 crosses over to RH Collector.
If you don't make em, i will make my own.
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