My question is. I m having a manufacturing cat converter on my car. Recently, I find the noise is getting louder and louder and so does the smell of the fuel. In additional, every time when I step on gas particular in the 1st gear, I find that the noise from the floor is louder and louder but without that momentum. The smell and noise make me to believe that the man. cat converter on my car is failure. However, I m not sure that power losing is also caused by the same thing ? If so, will the aftermarket cat converter help to solve the power losing problem; or the aftermarket cat converter just gives a better filtering ?