BOS 

is a family business in the Netherlands, now in its second generation, developing and manufacturing high-quality exhaust systems for motorcycles. State-of-the-art manufacturing technologies, the exclusive use of high-quality materials, and expertise in all aspects of demanding motorcycle exhaust systems have made BOS one of the leading brands in Germany, and even in Europe. 
BOS mufflers are more compact and lighter than standard exhaust systems. Performance and torque are optimized. The deep, robust, and very "mature" sounding exhaust note is the characteristic trademark of BOS. Each muffler is specifically homologated for the respective motorcycle model. This guarantees absolute riding pleasure without unpleasant consequences.
Model-specific exhaust systems from BOS can be found in the Wunderlich program.