The Vintage Semco RC Helicopter Muffler is a rare and sought-after accessory specifically designed for Enya .49X engines, commonly found in RC helicopters. Made for nitro and glow fuel vehicles, this muffler is compatible with helicopters and provides a crucial component for controlling engine noise and vibrations. As a unique and valuable piece for RC enthusiasts and collectors, this vintage muffler is sure to enhance the performance and aesthetics of your RC helicopter.