Muly savinelli Trevi 320 arrived from Amazon today. I took a test draw and am hearing a high pitched whistle! I took that to mean the pipe was improperly drilled and immediately packed it back up and started the return process. I then came to realize the pipe takes a balsa filter and wondered, is that why the pipe is whistling? I don't know if I should have a bowl, if it whistles I am sure the pipe is not up to standard and I want to be able to return it if its not. What should I do?