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Rb25det twinscroll turbo manifold

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Hey guys I am looking into getting a twin scroll manifold set up on my z. I have a 75 280z with an rb25det. What I need help with is which manifold to go with that will fit and not have clearance issues as I will need two wastegates. On top of that I’m not too sure as far as wastegate size?  Since I will be running two wastegats will a 38 mm or 44mm be better due to the split with air flow? Btw I am running a borg Warner sx300 66/74 turbo. Ty

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