Since the switch to four-stroke motorcycles several years back, many aftermarket exhaust companies have put aside their desire to improve two-stroke performance parts. Not Pro Circuit. Four-strokes might have become the primary ride for most riders, but that doesn't mean we are going to stop improving our line of pipes and silencers for the two-stroke fanatics. The Ti-2 Shorty Carbon Kevlar/Titanium Silencer is the latest piece of racing technology we offer and is guaranteed to be a favorite for most two stroke riders.