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 RPM range—ideal for aggressive 3D maneuvers, precise collective pitch flying, and stable hovering.

Primarily designed for the O.S. Max 105HZ and 105HZ-R series engines, it provides optimized resonance tuning that enhances mid-to-high range punch without excessive heat buildup or restriction, ensuring cooler, more consistent runs even during demanding flights.

Key compatibility note: This pipe also fits and performs exceptionally well on the O.S. 91 and O.S. 91 Speed (including HZ-R variants) thanks to matching exhaust flange mounting. Many pilots upgrade their .91-powered helis (like Trex 700N or similar setups) with the 105 PowerBoost for noticeable gains in power delivery and overall efficiency—often described as a "great matchup" for both engines.

Highlights of the OS105 PowerBoost Pipe:

• Optimized for Helicopter Performance — Tuned specifically for heli applications, balancing explosive top-end speed with smooth low-end and idle stability.
• Bolt-On Simplicity — Direct fit with standard O.S. mounting (note: some setups use reverse bolting into the case on 105-series engines).
• Lightweight & Reliable — Aluminum construction keeps weight down while resisting heat and wear for long-term durability.
• Proven Results — Widely praised in the nitro heli community for transforming engine output—more power, better consistency, and reduced tuning hassles when paired correctly.

Whether you're running an O.S. 105HZ-series beast or boosting an O.S. 91/91 Speed setup for extra edge in 3D or sport flying, the OS105 PowerBoost Pipe is the go-to choice for serious nitro helicopter enthusiasts seeking factory-tuned excellence. Pair it with a fresh head gasket, proper needle settings, and always follow nitro safety practices for peak performance and longevity!