When designing the PowerCore 4 HEX, we looked at our top of the line products to deliver race-inspired performance at an economical price. The end result is a quality muffler with improved torque, increased horsepower and rugged durability all at a price that won't break the bank.Features Overall increase in power and torque. Durable stainless steel and aluminum construction. Space Age internal packing material for maximum longevity. Internal shape of core uses Hi-Flo technology. Enhanced sonic evacuation provides for higher flow and increased power. Includes removable spark arrestor. Can be used with FMF or Stock OEM Header