Port tube flared 2-6in, which one and why?

The smaller diameter the shorter the port needs to be. You want more port area so the larger the diameter the more port area you get. If you double the number of ports you more than double the port length needed for each port.

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If you do 4FT box tuned to 32 you need 1 6.34" long 4" port, but if you use two 4" ports you need 14.6" to get the same tuning.

 
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