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does the 25 vvt head fflow as much as the non vvt head. My consern is that the non vvt inlet manifold looks more like the rb20 inlet manifold then a rb25 vvt manifold. are the inlet manifolds interchangeable.

also are the rods in the non turbo rb25 motor the same as the turbo motor.

thanks

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The head flow difference is marginal. Its the vvt that is worth while.

The manifolds look the same but they are not as the r32 rb25de head has ~10mm over all wider ports, so all though they look the same on the outside the inside is different.

Manifolds r33 -> r32 are not interchangeable.

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