FMF Powercore 4 Hex Muffler Yamaha WR250F ('20-'21) | 044471 offroad TMD invented the plastic case

TMD invented the plastic case saver and has proven to not damage the cases like aluminum

while additional tread angles enhance grip

high-strength 1st gear

stronger and more powerful than stock exhausts

front profile provides the best feel and confidence when traction matters the most

FMF Powercore 4 Hex Muffler Yamaha WR250F ('20-'21) | 044471 offroad TMD invented the plastic caseWhen 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