They are upgrade pipes that are designed to make power and get maximum performance out of you motor. If you are just learning to fly, don't worry about getting maximum performance out of your motor, spend your money on fuel and learn to fly. Once you progress with your flying and move into 3D flying, then maybe look a getting a tuned pipe/muffler. A beginner won't notice much of a difference, and more then likely have nothing but problems, some tuned pipes/muffler can be a pain to get setup right (if you are a beginner).