Thanks to its 270-degree crank, the Yamaha FZ-07’s parallel-twin engine has a more inspiring character and engine note than ordinary parallel twins. However, the stock exhaust keeps things quiet. A little too quiet. In addition to dropping weight and boosting power, a nice aftermarket exhaust will add the auditory expression the FZ deserves. The stock machine has a one-piece welded exhaust system, so if you’re considering a slip-on instead of a full system, it will require cutting the stock pipe.