Slant six dual exhaust proposal

I will be running these headers ( Pacemaker ) with a single 2 & 1/2" exhaust with a Mercury Super-Turbo muffler.
They have 1 & 1/2" primary pipes, 2" secondary pipes....with a 2 & 1/4" outlet....but that will be swelled out to 2 & 1/2".

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