The Driver's side manifold has the #5 cylinder firing right before the #7 cylinder fires.
If the manifold is open, no divider, you would think that exhaust gas from the #5 would try to flow toward the #7 port and would tend to block some of the exhaust gas trying to exit the #7 cylinder. More back pressure in that #7 cylinder vs the other cylinders.
Forcing the #5 exhaust to move toward the manifold discharge flange would remove some of that backpressure when #7 exhaust valve opens.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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