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Top (adjustable) and bottom ventilation ports within the lens
and enhances impact protection by decreasing movement during use
Lens Lock System
Removable USFS approved spark arrestor
FMF Racing Powercore 4 HEX Titanium Slip-On MX Exhaust Regular Top (adjustable) and bottom ventilationFMF PowerCore 4 HEX Slip On Exhaust When designing the PowerCore 4 HEX Exhaust, FMF took a hard look at their top of the line mufflers to produce race inspired performance at a more economical price. The end result is a quality muffler that delivers improved torque, increased horsepower and rugged durability all at a price that won't break the bank. Features: Increase in power and torque through entire RPM range Durable stainless steel and aluminum