The raw aluminized steel Aero Chamber is designed to do much more than simply muffle exhaust noise. The Aero Chamber Muffler produces a deep throaty powerful sound that will not change with time. The Hooker Aero Chamber uses a unique step principal, similar to that which is currently popular in racing header design. The aerodynamically designed chambers flow 23% better and produce more horsepower and torque than the most popular high performance brand. Feature intricate stainless steel, robotic weld seams Single 3” Center Inlet Single 3” Center Outlet 4-3/4“H x 10-1/4“W x 14“L 16 Gauge Raw Aluminized Steel Case Reinforced Inlets and Outlets Stainless Steel Perforated Internal Plate Eliminates Internal Rust Aerodynamic Lens Directs Sound Pressure Waves into Acceleration Chamber and Out of Muffler Sound Absorption Chamber eliminates High Frequency Sound Waves for Deep Throaty Powerful Sound Resonance Chamber and Tuning Tube Cancels Unwanted Frequencies and Amplitudes (No annoying tin can sound or drone at cruising speed) Stepped acceleration Chamber Increases Exhaust Gas Velocity and Maximum Flow Three Internal Bulk Heads for Superior Case Durability and Stability