Aside from the fact that the S63TU4 is completely re-engineered from the S63TU in our F10/F06/F12/F13
I'm still wondering the exact same question as the OP.
Does the tube equalize pressure between the two banks?
Why is that?
My S63TU datalogs doesn't show much difference between the two banks in relation to manifold and pre-throttle boost
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