Feature intricate stainless steel, robotic weld seams Stepped acceleration Chamber Increases Exhaust Gas Velocity and Maximum Flow Resonance Chamber and Tuning Tube Cancels Unwanted Frequencies and Amplitudes (No annoying tin can sound or drone at cruising speed) Sound Absorption Chamber eliminates High Frequeny Sound Waves for Deep Throaty Powerful Sound Aerodynamic Lens Directs Sound Pressure Waves into Acceleration Chamber and Out of Muffler