The A6 manifolds have a very long runners, very small plenum, and does not allow for mounting most larger TBs.
The Z6 manifold has a larger plenum, shorter, wider runners, a more "standard" TB setup, and internally is really good entrances to the ports as cast, though I haven't seen the inside of an A6 to compare.
I don't know about the P08 manifolds.
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Not so obvious and ruthlessly odd . . .
My quench is tighter than yours! :P
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