Ti-2 Carbon-Titanium R304 Silencer. The Ti-2 Shorty Carbon / Titanium Silencer is the latest piece of racing technology Pro Circuit offers and is guaranteed to be a favorite for most two-stroke riders. The Ti-2 is similar to the popular R-304 Silencer, except it is constructed with a carbon shell, titanium tubing and titanium end-caps. The titanium and carbon aramid construction offers the "factory" look and appearance while reducing weight. Optimum performance gains. Carbon-aramid silencer body. Titanium tubing and end-cap. Double-walled aluminum mounting brackets. Made in the U.S.A. Note: The Ti-2 is for closed-course racing ONLY.