Arrow Street Thunder Exhaust for Honda CB1000R from 2008 to 2017. Choose the most versatile and absolute icon of Arrow silencers, with the Thunder model. Thanks to a steel structure and a carbon tip, this muffler optimizes the performance of your CB1000R. The muffler is 6.87kg lighter than the original, giving you 3.5hp more power and 8.04Nm more torque....