It can be good for the O.S. 50 Hyper and YS 50 helicopter engines. This high volume muffler and includes standard hardware for mounting the muffler to the engine.It is quieter and more powerful than any other 3D pipe - believe me! Specifically designed and tested for the O.S. 50 Hyper and YS 50 by top pilots,

This pipe produces great power at a wide range of RPM, especially at the high RPMs required for todays grueling 3D!Most top pilots run this pipe at 2000rpm!Wish you could like it!

50muffler specifications:

Lenghth:220mm

Connecter length:20mm

Diameter:41mm

Weight:including the spare parts is 0.2kg

Material:aluminum alloy