Peter,

If it's a spec G-grind, the came will be ~$100. And even if you limit the port size to the OEM intake gasket, you can do a lot inside the head, not to mention the time on the flow bench to get it maximized. And I don't know if you said how deep you could port the manifold. I can see a lot more than $300 in machine work and flow bench time.

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MARRS #25 ITB Rabbit GTI