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Larger will flow better but its the most advantageous to have the larger pipe up front where the gas's are hottest. The small down pipe will be your first restriction.
My turbo car has a 3" down pipe and then 2.5 the rest of the way back. Im not seeking big HP so this works fine, the SBD turbo isnt very big so a nice 2.5" setup should do just fine.
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