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1) if there are two pipes, individual diameter of each should be lesser, hence ease routing of two?
2) imho it's not THAT hard, after all, Ace header's overpipe somewhat already does that
3) i'd still drop that idea due weight dual pipe design will bring, and extra costs (especially due one-off custom work and due need to design all the exhaust till end of car this way) / complexity. Or do that only with direct side exhausts, where issues of weight and need to make rest of exhaust dual too would be lesser.
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