anyway, whether OS-50 Hyper, Yamada 50-ST, Redline-53 or other even more modern engines, don't care, the power output (including 3D) is more then delighting meanwhile engine manufacturers try to keep their sales rate by increasing the displacement and more costly mufflers. so if it runs well, keep your combo running (=flying) an engine/muffler-system is only as good as you are experienced to tune it. I would keep your MP5 and invest your money in fuel and training. IMO MP5, Hi-Flow TT muffler and others will give a good result, considering you take your time to tune your engine or to learn how to tune an engine. The RL-53 is a pretty nice engine on modern 3D nitro helicopters.
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