If you run the port externally, does it take up space or add to space inside the enclosure. Same idea as inverting your subs, they still take up space inside the enclosure, correct?

Thanks

Considering the port on the inside took away area you could say that it adds it; however, it isn't logical to look at it that way. For instance if you have a 2cuft box and you add an external port it is still a 2cuft box, but if you made it internal it would eat room and it wouldn't be 2cuft anymore.

So, the only downside to external porting is the appearance?

apperance and size...