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alot depends on the original manufacture and design that has gone into it. for instance the head on a type r is alot more refined then on a 1.3 civic. But then if you compare the efficiency of those to a ford/renault they probably alot worse on similar models. in any case try to find a trustworthy tuner with proven experience with the engine you want to modify.
i have heard alot of differences with intake ports there is alot you can change , not just with the surface, or the bore, but with the actual path the charge has to follow to reach the cylinder.
its all fun and games
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