21st Century Overview - Exhaust

Exhaust gases (emissions), which the products of combustion, are pushed from the engine cylinder by the piston during the exhaust stroke into the exhaust manifold, catalytic converter, muffler, and tailpipe.   These gases are carbon dioxide, carbon monoxide, various nitrous oxides, nitrogen, carbon particles ("soot"), and nitrogen,   The catalytic converter reduces emissions.   The muffler that reduces sound produced by combustion.