Maximize Your 2-Stroke's Performance with FMF Racing PowerCore 2 Shorty Slip-On Silencer Exhaust: Compact Power for Competitive Riding The FMF Racing PowerCore 2 Shorty Slip-On Silencer Exhaust is a high-performance upgrade designed specifically for 2-stroke motorcycles. Building on the success of the PowerCore 2 silencer, the Shorty version offers enhanced power in the lower and mid RPM ranges, making it an excellent choice for tight tracks and supercross applications.