Catalytic Converter System Description - Overview
The warm up three way catalytic converter (WU-TWC) and the under-floor three way catalytic converter (under-floor TWC) convert hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) in the exhaust gas to carbon dioxide (CO2 ), nitrogen (N2 ), and water vapor. The WU-TWC is attached directly under the cylinder head that is integrated into the exhaust manifold.