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I remeasured the inside of my box and if there was a 52cm port there, there would be 6.5cm of breathing room. And while i was there i also extended the port as close to as i could get it to 52cm, the best i was able to do was 49cm because my left over 4 inch pipes were flared. Will that do the job? I would extend it to 52cm in the future but as of for now i no longer have any 4 inch pipes left.