Stock exhaust cans are heavy and by removing them you are shedding some weight, but are you gaining any horsepower from taking the can off? Louder might make it seem like your bike is moving faster, but it’s not. After testing a Yamaha YZF-R3 with and without the muffler, we found no negligible difference between the two in terms of horsepower. The only thing that changed was the sound. The YZF-R3 is equipped with an underbody catalytic converter, that traps most of the exhaust sound. If your bike is not equipped with one and you remove the muffler, it will make your bike obnoxiously loud. Don’t be that guy.