Only on cars equipped with diesel engines. Diesel catalytic converter is equipped with a DPF or Soot Trap. All diesel engine powered vehicles built after 1/2007 must be equipped with a Diesel Particulate Filter (DPF). As the amount of soot trapped on the DPF increases, so does the back pressure in the exhaust system. Periodic regenerations (high temperature excursions) are required to initiate combustion of the trapped soot and thereby reducing the exhaust back pressure. The amount of soot loaded on the DPF prior to regeneration may also be limited to prevent extreme exotherms from damaging the trap during regeneration.
catalytic converter
All cars made since 1975 in America have a catalytic converter.
The main usage of a MagnaFlow Catalytic Converter or any other catalytic converter is commonly the reduction of toxic emissions in the exhaust systems in cars.
There are two (minimum) in the exhaust systems on late model cars and light trucks. They are installed before and after the catalytic converter as the gas flows through the system. Thus pre and post "cat" (Catalytic Converter)
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Absolutely not. The fumes released from any engine can be deadly without a catalytic converter and severely harm the environment no matter how efficient the engine is and no car can legally not use a catalytic converter.
All vehicles registered in, or commuting at least 60 days into, Bernalillo County are required to pass an emissions test every two years. Part of the emissions test is a visual inspection to confirm that the vehicle has a catalytic converter(s) installed. Outside of Bernalillo County, state or local laws do not (as far as I know) require catalytic converters, but Federal law may prohibit you from removing your cats from your vehicle. Federal law requires all cars as built after 1975 to be equipped with a catalytic converter.
Catalytic converter
Almost all cars have only one catalytic converter. Some can have two, four, etc.
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to limit the air pollution the car puts into the atmosphere.
Government required emission regulations.