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. -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. Item ID: 044495Type: Slip-OnConfiguration: SingleConst: AluminumFinish: Gray AnodizedMidpipe: Stainless SteelEndcap: Stainless SteelSpark Arrestor: Screen Insert (included)Carb Warning: noQuiet Insert: Quiet Insert (sold separately)