So, I have only seen a million, well maybe a little less, threads on mouthpieces. I thought I would contribute one more. At the request of my instructor I tried the Yamaha 16c4 mouthpiece today as I ran through my first session. I was on it for an hour and all I can say is WOW! That thing is a beast. I love it though, I love the amount of warm air I can blow through the horn. It also made my tone a little more mellow. Now, the true test comes after the honeymoon is over. Will I still be able accomplish my objectives. It also seems to have address some slotting issues I was having.