Intakes and tailpipes

I have multiple projects going, everything from ships to well this


Im not sure if i should boolean a hole most of the way through or just have a small pit. Or if thats even the way to do it.
Also the tail pipes, what is the animation or is it a xml thing.


Im not sure if i should boolean a hole most of the way through or just have a small pit. Or if thats even the way to do it.
Also the tail pipes, what is the animation or is it a xml thing.