When designing the PowerCore4, FMF looked at their 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. This FMF slip-on main silencer is made from the highest quality materials, and not only stands out from the standard silencer with its appearance, but has been optimally adapted in terms of torque and power to the power characteristic of the series engine. Note: Installation ONLY possible in combination with original manifold.