I just put a Tower Hobbies .46ABC on my Seamaster to replace a 15yr. old SuperTigre. I went with the Tower because of the price. The engine runs and starts just fine and seems to have good power but it's quite a lot louder than the OS that's on my Ultra Stick. Noise isn't a problem when flying off the water, but at our flying site it is. I've never used anything but stock mufflers. Anybody got recommendations for an aftermarket muffler? Once I put an after market muffler on that cheap engine I might as well have bought the OS .46.