* Apply to 50 size helicopters, according to the strength character of 50 engine to design, features the highest air exhaust volume on the market.
* Great design and test to three spaces: expansion chamber, accelerated section, silencer chamber, high efficiency and the quick respond of medium speed and high speed, great for 3D flying.

Specifications:
* Size: 41.2 x 270 x 70.5mm

Included in box:
* Pressure nipple x1
* Tube stopper x1(13x16x18.5mm)
* exhaust guide x1(16.5x79.75mm)
* Spacer x2
* Collar screw x2(M3x35mm)
* Spring Washer x2