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Pipes that can be bent or flexed to connect the exhaust system

Compounds composed of hydrogen and carbon, emitted by vehicles as unburned fuel, contributing to air pollution.

Colorless, odorless gas produced by the combustion of fossil fuels, contributing to climate change.

Catalytic Converter. a large, usually round cannister in the exhaust system. it helps convert emission gases into more harmless, less noxious vapors.

Environmental Protection Agency. Another agency of the U.S. Federal Government that gets involved in automobile construction, especially in the engine emissions area.

Device used to measure exhaust gas content, including carbon dioxide, carbon monoxide, oxygen, and hydrocarbons.

Exhaust Gas Recirculation. One of the emission control techniques, in which gases are sucked from the exhaust pipes (before the muffler) and re-circulated through the intake manifold (to be 'burned' again). the high heat associated with exhaust gases required expensive metals ... so replacing/repairing this system can be costly.