Mousse cans do work; its like a homemade Tower muffler. I think the big question is how much more power do you need? You are not going to turn the engine into a .60 if that is what your after. If you spend too much trying to make it better, you could have spent it on a bigger engine. I spent $50-70 on trying to prop a SuperTiger .90 with the best prop when I needed a different engine and could have put the money to better use buying it.