Its unique design makes a deep resonant sound and enables it to obtain the maximum output. Increase in Performance, Horsepower & Torque Hand crafted, Uni-construction styling Polished, Brushed Stainless Steel and Black Powder Coated finish Synthetic wool for acoustic insulation and long life Detachable db reducer Baffle core for back pressure and efficiency Completely made of Stainless steel -304 Grade ( Nuts, Bolts, Clamp, Core) Dyno tested.