I have had the opposite experience from most on this posting I guess. I've had several system Petersons, and they all gurgled.
I won't buy another Peterson for that very reason. Other pipes that I have that are of similar shape to the bent Petersons, have not gurgled, while a few others have. Was it the way they were built? The briar used? The way I packed them? Smoked them? Who knows.
I know that just because a pipe is bent, doesn't mean that it will gurgle. I have a Savinelli, a Ser Jacopo, a Cristiano and an Ashton, fully bent. They have never gurgled. I once had an S. Bang Oom Paul that never once gurgled. And I smoked them just the same as I do every other pipe. Why some gurgle and some don't, I wish I knew.
As I wrote in another post, the only Peterson I kept is a Sherlock Holmes system pipe. I use Savinelli 6mm balsa inserts pushed down into the reservoir. It smokes like it should then.
Some people are less bothered with the gurgle than I am. I once asked an older pipe guy who was smoking a drugstore pipe if he was ever bothered with it gurgling. He said it did, but he just blew it back into the bowl, and continued smoking.
I tried that and ashes flew everywhere. It never seemed to bother him though.