I have to agree with ted.. it would be better to do this with a S4 manifold, since you are negating the affects of the S5 independent twin scroll. the exhaust pulses mix at your wastgate connection. maybe if you use dual wastegates, one for each line?
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1993 RX-7 Touring MB, stockport 13B-REW, 9.4CR rotors, T04S 60-1/p-trim single turbo
1986 RX-7 Base project track beast
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