Typical aftermarket slip-on exhaust systems are usually lighter than standard pipes, have a bit more growl and, hopefully, are styled to get your attention. As far as big performance gains go, well, don't get your hopes up.
But there's nothing 'typical' about Akrapovič's Slip-On Line. In fact, the dual carbon-fiber mufflers developed for the 2011 and 2012 Triumph Speed Triple and its even racier brother, the Triumph Speed Triple R, are said to boost both horsepower (5.5 hp @ 8,650rpm) and torque using stock fuel-injection mapping.
Plus, they weigh nearly 4.5 kilograms less than the Triumph stock exhaust system. A 2-into-1 stainless-steel link pipe and retaining spring, carbon fiber mounting brackets and a header clamp are included. More information see Cheap Cycling Parts.