The downpipe starts as 4" and then became a 3.5" and 3" to fit around the transmission oilpan. The other side was connected to the wastegate. I made a new lower part of the downpipe that split from 4" to two 3" and those should flow about the same. The area of two 3" is about 12% more than the area of a 4" but there is less wall friction in a 4" pipe. One pipe go under the converter so the exhaist flow can go both ways around the transmissioin oil pan. I made a simple open exhast for the wastegate,

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