The Genuine Kyosho Silencer Muffler Exhaust is specifically designed for 30 size RC model helicopter engines, particularly compatible with OS Max 28 32 37 engines. This high-quality muffler features an adapter that rotates 90 degrees for added convenience. Made by trusted brand Kyosho, this muffler is suitable for helicopters using nitro and glow fuel, catering to a 1:10 scale model. Upgrade your RC model vehicle with this reliable and efficient exhaust system to enhance performance and reduce noise.