- Drills 4 or 6 holes in the muffler (4 mm), this let the engine better works, noise increase is not so big. Engine is working a lot better !

- You can even try to take out the whole baffle, and win 200rpm -> this increase the sound a little bit.

- TIPS :
Overtighten the exhaust screw when the heli is still hot (after a 3 min flight for ex.). Replace the philips screw with hex screws (3mm)

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