The Vance and Hines Mini-Grenade 46874 Black exhaust is an aftermarket motorcycle exhaust system. The exhaust system itself does not determine the speed of a motorcycle. The speed of a motorcycle depends on various factors, including the engine power, torque, weight, aerodynamics, gearing, and other mechanical aspects of the motorcycle.
The Vance and Hines Mini-Grenade exhaust system is designed to improve the performance and sound of the motorcycle, but it does not directly impact the top speed or acceleration of the bike. The speed capabilities of a motorcycle equipped with this exhaust would depend on the specific motorcycle model, engine size, and other performance modifications or factors.
If you are referring to a specific motorcycle model that comes with the Vance and Hines Mini-Grenade 46874 Black exhaust as the stock option, please provide the details, and I can try to provide you with more specific information.