Yep, points taken .. I concede.
It does look like the rear header favours the right hand silencer to a fairly noticeable extent, and even the front one does to a small extent too.
A picture speaks a thousand words, eh ?
I should have gone into the shed and studied my old headers instead of working from memory.
I must admit that I was already considering that the initial bends towards the right hand side might mean that the gases would tend to hug that side of the pipes, even though they straightened out further along (memory says this might be called the Coanda effect).
Anyway, yep ... it does look like the flow favours the right hand silencer.
Which tallies with Alan's experience of that can feeling hotter than the left hand one.
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