Hatori SB15FH is designed around the YS91ST and OS91SXH. This is the ultimate torque accelerator for your favorite .90 engine. Long rubber deflector will keep your Heli clean. Flanged mount.

The Muscle Pipe 5 90 has great power throughout the RPM range. Smooth and snappy engine response good for both FAI and 3D flying styles. More power than the previous MP 90 and at a higher RPM band. Increases power over standard mufflers by .3 - .5 HP. Runs well on nitro levels for 5% to 30%. Includes all mounting parts for OS, YS and Thunder Tiger. Mounting works on forward or rear facing engines. Designed and flown by multi-time world champion Curtis Youngblood.

The Muscle Pipe 5 50 has great power throughout the RPM range. Low noise and tunes even easier than before. Comes with everything you need to mount in a simple and durable one-piece design. The MP5 50 is a great improvement over the older MP2. Runs great on both OS and YS motors. Designed and flown by multi-time World Champion Curtis Youngblood. Easy to install.

Power, ease of use and reasonable price are all reasons why the MP2 80/90 is a very popular choice of Heli pilots worldwide. Works with OS and YS engines in the 70 - 90 ranges. Works well with or without a governor. Includes all mounting parts for OS, YS and Thundertiger. Mounting works on forward or rear facing engines.

Muscle Pipe. The MP5 30Q and MP5 50Q gives a big power boost over any standard 30 or 50 size mufflers. It is a great way to get that extra performance and stay within your club noise limits and your budget. One piece muffler that comes with all the needed hardware to install and use. It gives a power boost of at least 0.3hp over any standard muffler while staying at the same noise levels.

Complete Hardware Set for the MP5 90 muscle pipe. Comes with all necessary bolts, nuts, pressure nipple, exhaust diverter and zip ties.

This is a replacement header for the MP2 80/90 pipe. It is the header only. Bolts, gaskets and pressure taps are sold serperately.

Replace worn out gaskets with these ones for OS 32, OS 46 and OS 60 - 91.

Replace the stock O- Rings with these Hi temperature melt resistance version.

Replace broken or damaged pressure Tap links with this high quality 4mm high pressure threaded tap link from Curtis Youngblood. Specifically designed for radio controlled Helicopters.

Silicone muffler clamp for replacement when KS1361 or KS1361.1 gets worn out. No aluminum mounting hardware parts.

Keep your muffler running quiet with this shock absorbing sound proofing silicone muffler clamp. The clamps is made of silicone so it resists heat very well and includes a side hold for mounting purposes. Clamp ID is about 35 mm.

Generic Muffler coupler with Zip ties will fit most engines. Made by KSJ with heat resistant rubber to avoid damage to the coupler even at very high temperature.

Align High Performance Muffler for 50 size helicopters. Features the highest air exhaust volume on the market. Advanced triple chamber design: expansion chamber, accelerated section, silencer chamber. Great for 3D flying.

Header for MP2 80/90 pipe.

Gaskets for the Curtis Youngblood MP2 80/90 pipes. Five per package.

Special compact design to fit all of Century's scale 46-50 helicopter kits. Double baffle with 6061T6 aluminum machined header. Anodized black with low noice and high performance. Mufflers are pressurized. Also allows easier fitting of other manufacturer's 46-50 size helicopters to fit into Century's fuselage kits.

The K and S 90 Super 3D Exhaust system is a direct bolt on design requiring no additional clamps or leaky o-ring seals. Constructed from CNC machined aluminum the KS 90 Super 3D features a beautiful polished finish that makes it look as good as it performs!

Keep exhaust fumes away from your radio controlled helicopter ( especially away from the canopy ) using these 35mm exhaust deflectors. Also, pointing exhaust fumes downwards will give you a clearer view of the Heli as the smoke screen blur will disperse away more easily with the help of an exhaust deflector.

The included tuned pipe increases the power of the engine while the solidly built muffler resists stress cracking. Plus they're easy to install just two bolts and you're ready to fly. Revolution's highly polished lightweight mufflers provide less wind resistance and better performance and look good doing it. They're also surprisingly quiet—perfect for sound-restricted flying fields. The included tuned pipe increases the power of the engine while the solidly built muffler resists stress cracking. Plus they're easy to install—just two bolts and you're ready to fly.