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I believe (have not done the calculations) that if you put both exhaust into
the same tube that you may find 24" is sufficient to get some good noise
reduction. However, in order to handle double the exhaust gas flow that
putting both exhaust ports into one tube, you might find that a 2"DIA tube
might be on the small size. I would probably think about at least a 2 1/2"
perhaps 3" dia tube. Unfortunately, I had little success in finding 3" dia
SS discs at least .062 thick. So I did not go down the 3" path.
A cross-over pipe is significantly different than combining the two tubes with a wye. Its length and positioning provide a set of resonances that can help damp the sound. The length of the cross-over itself combined with the length of pipe between the engine and the cross-over tee, and the length of pipe from the tee to the first muffler baffle all play a role. Not a simple system by any means.
Perhaps one could nickel plate a section of 4130 airfoil shaped tubing for the cross-over.
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