two inch schedule 10 pipe to a two into one collector with a divider plate between the collector to keep the exhaust from tumbling before merging all the way to a 2.5 to 3 inch concentric reducer on a t4 flange. schedule 10 pipe is used due to the strength of the material compared to traditional gauged stainless. both feed pipes are asymmetrical so by therory it should scavenge the same between the two banks. that should answer the questioning on the hot side piping.
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