Exhaust system Law in the United States and other countries to not have a catalytic converter. Converters may not be removed from a vehicle that is used only for "off-road" driving in the United States. The main purpose of a catalytic converter on an automobile is to reduce harmful emissions of hydrocarbons, carbon monoxide and nitrogen oxides into the atmosphere. They work by transforming the polluted exhaust components into water and carbon dioxide. Cat-back (also cat back and catback) refers to the portion of the exhaust system from the outlet of the catalytic converter to the final vent to open air. This
Aftermarket exhaust parts pipe or the pipes temporarily merge. This is to equalize the pressure in both exhaust pipes. Exhausts emit a large amount of heat into the engine bay, which can have a negative effect on engine performance by raising the underhood temperatures. As a result, high temperature insulation is used, more commonly known as heat barriers, for exhaust heat management. Thermal barrier ceramic-coatings are specifically designed to reduce heat loss from engine exhaust system components including exhaust manifolds, turbocharger casings, exhaust headers, downpipes and tailpipes. When used under-bonnet, these have the positive effect of reducing engine bay temperatures, therefore lessening the