Below there is an image comparing the pipes. I asked many questions as to why my pipe was gurgling here and got many answers. But few mentioned the pipe itself. So the answer is there: the pipe.
My first pipe (the long imbuia Bazzanelli below) gets hot very easily and gurgles a lot. The second pipe (the short briar [duh] Savinelli) practically doesn't gurgle and its temperature doesn't get too hot. And I still smoke very intensely.
What I'm saying is that, from my experience, low quality pipes can gurgle a lot and that change of wood and quality made the difference for me.
*Edit.: without filters.
My first pipe (the long imbuia Bazzanelli below) gets hot very easily and gurgles a lot. The second pipe (the short briar [duh] Savinelli) practically doesn't gurgle and its temperature doesn't get too hot. And I still smoke very intensely.
What I'm saying is that, from my experience, low quality pipes can gurgle a lot and that change of wood and quality made the difference for me.
*Edit.: without filters.