Apply to 90 size helicopters, according to the strength character of 90 engine to design, features much increase the horsepower, fuel-saving, low noise, and 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.
* Use for O.S 91SR/HZ & ALIGN 91H/HP engine.
Specifications:
* Size: 49.1 x 318 x 81.75mm
* Weight:260g
Included in box:
* Pressure nipple x1
* Exhaust guide x1(13.5x18.5x79.75mm)
* Spacer x2
* Collar screw x2(M4x45mm)
* Spring Washer x2
* Strap x 1(100mm)
