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when "they" say 2 in to 1 on parallel twins work but on V / L twins it doesn't improve power the only thing I can see that is majorly different is the length and frictional losses on the rear cylinder.
Just a thought for you;
If you look at the losses on the rear/ shorter link pipe you could add a plate valve (washer with a hole) to get the pressures/ and fluid movement of the exhaust gasses equal on both cylinders.
Or just build it and see how it works.
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