In order to find the exhaust systems on a car, there are very few simple things that one must do. One must look into the car's owner manual and find information about where it is located.
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an exhaustion tank is found in the back of a car
One can purchase aftermarket car exhausts at a variety of online websites. Some examples are: "StreetBeatCustoms", "PepBoys", "AutoAccessoriesGarage", and many more.
combustion
Catalytic converter.
catalytic converter
It is in cigarettes and is the same gas that comes out of car exhausts!
catalytic converter
Catalytic converter
Catalytic converter ,
catalytic converters
You can find information about BMW exhausts from the user manual you got with your car, if you own a BMW. If you don't, you can either go to a garage or look on BMW's website for answers.