FMF YAM WR450F'20-23 P-CORE 4 HEX MFLR 44462FMF YAM WR450F'20 23 P CORE 4 HEX MFLR 44462 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