Dual exhaust - surprise increase or imagination?

On the benefits of duals...the earlier V8's, pre-1941 or 2, have smaller manifolds and outlet pipes than '42-8. '49 and up have what at least looks like a really terrible system with the left bank exhaust forced all the way through the right manifold before it can start looking for daylight. Do different years react differently to adding a second pipe?
 
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