When company calls for 2.25 vb is that with port

i have 2 JBL W12GTI MKii and the specs calls for 2.25 per speaker is that with or without port and how big should I make the port I was thinking 4 in 

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Usually, the recommendation volumes from brands don't consider the port displacements. It considers displacements when they offer ready blueprints with the port on them. Your port size depends on the driver, box, and box tuning

Without the port