interchangable ports

[swishahouse22]

how do I go to doing changeable ports

[Swaggasaur]

My port is interchangeable

this is made with a 1.5 in. router bit

its held in by allen screws and to change tuning, you could length or shorten, widen etc.

[swishahouse22]

I wanna do it im sure id figure it out jus how to figure the tuning with the actual box when u put a bigger or smaller port u change the boxes displacement