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the z6 runners are meant for alot of top end power. the y8 manifolds plenum is huge and it has shorter runs that are used for to make more low end power. the z6 head already flow great on top end so going with the y8 manifold can weild better low end gains. mixed with a hondata intake manifold gasket you will feel more low end power. i did it and loved it.I see alot of people on here refering to the d16y8 manifold as an upgrade, but is it an upgrade from the z6 intake manifold? It does look to have a bigger plenum but i'm curious if anybody has seen any gains from this swap.
plus its great for boost.