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The heart of the system is the sound-cancellation chambers. Unlike mufflers that use baffles to divert (and restrict) the flow of air, these chambers are a straight-through design that uses RSC technology to reduce unwanted resonance and noise, not airflow. RSC (Reflective Sound Cancellation) is a situation where noise is suppressed by opposing sound pressure waves that are 180 degrees out of phase. And theres no sound-deadening packing material, which is bound to render itself useless over time.