I get it but don't see the point. Why have a huge TB if the manifolds gonna stay small? That bottle neck can't be good. now if this spacer is long enough with a nice taper, that could speed the air up some and help. But a spacer matching the bigger TB then having the back side be larger than the manifold hole is going to be horrible for flow as the air will hit a lip.
What really needs done is machine the manifold completely removing the gasket ring section so the holes 75-80mm. Then siliconing or getting enough gasket to hold tight on the flat surface of the spacer and manifold. Then it'll be a smooth transition being true all the way through. But with that much air will our motor be able to take it? Where will the power curve move to?
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13 370z-
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