FMF KAW KX450F'19-23 POWERCORE 4 HEX 042367 MFLRFMF KAW KX450F'19 23 POWERCORE 4 HEX 042367 MFLR 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