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The manifolds alone not much if not any
With head work and cams your guaranteed to get power depending on who worked the head and who will be mapping it.
I cut up a 1*2 manifold to see if there is any gains
I ported it and reshaped the ports and bell mouth etc and the gains were..... None
As said above. RS2 inlet or custom like it.
I would recommend doing the inlets if the head is done at the same time as they respond well to head work
On there own its not really worth it, i will do them if people ask me but only with the head now