The NOVAROSSI 41024 747/10CE on-road exhaust manifold is designed specifically for .21 nitro RC engines, making it compatible with Novarossi engines. This high-quality Italian-made part is suitable for advanced RC enthusiasts aged 12 and up, providing a reliable and efficient exhaust system for optimal performance on the road. With compatibility for nitro and glow fuel types, this exhaust manifold is a valuable addition to any RC vehicle setup for increased power and durability.