Hi,i'm driving a Perodua Kenari . I want to change the exhaust system but don't want the exhaust sound to be too loud.I've ask some exhaust shop,they ask me to change the center bullet and add another .Tat mean use 2 center bullet.This will make the car more powerful and the exhaust sound won't be too loud.Is this true tat i use 2 center bullet my car vil be more powerful and the exhaust sound won't be loud?