OSM72146000 OS Engines Powerboost Pipe 105/91OS Engines Powerboost Pipe 105 OSM72146000 Product Information The O. S. PowerBoost Pipe 105 (also known as the 105HZ PowerBoost Pipe) is the factory engineered tuned exhaust system from O. S. Engines, purpose built to unlock maximum performance from nitro helicopter engines. Crafted from high quality aluminum with a polished natural finish, this lightweight yet durable pipe delivers exceptional power, torque, and throttle response across the entire