“Apply to 90 size helicopters, according to the strength character of 90 engine to design, features greatly 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.
Pressure nipple x 1
Exhaust guide x 1 (13.5×18.5×79.75mm)
Spacer x 2
Collar screw x 2 (M4x40mm)
Spring Washer x 2
Strap x 1 (100mm)
Size: 49.1 x 318 x 81.75mm
Buy it here.