"Aqua Silencer" is an attempt to cope with the global emissions control and undesirable sound in the tailpipe of a vehicle before being released into the atmosphere. It can be fitted together with or instead of catalytic converter in the exhaust pipe of the exhaust system of a vehicle. Sound produced by the operation of a motor can be controlled using water, since the sound produced under water is less audible than that produced in the environment. This mainly due to the small pine nuts in water molecules, which lowers their amplitude therefore decreases the sound level. Due to this property, water is used in this silencer and hence its name, "Aqua Silencer". Nor is there any effect of the same after installation on the fuel performance of a vehicle, which may be gasoline or diesel. Emissions exhaust gas can be controlled using an activated carbon layer which is highly porous and possesses few extra valances and has high adsorption properties, and therefore attracts dangerous to him gases and releases much less position the environment. The level of noise and smoke coming out of "Aqua Silencer" is considerably lower compared to the conventional silencer; It is also cheaper to build and maintain. There is no need for catalytic converter to fit with it, they do not result in any complication in mounting and easy to install.