Catalytic converter for exhaust gases

A catalytic converter assembly, suitable for cleaning the exhaust gases from an internal combustion engine, which comprises housing means, having exhaust gas entry means and exhaust gas exit means, said housing means including a catalytic body formed from a plurality of separate catalytic converter modules, each module having an inlet and outlet for the entrance and exit of said exhaust gases, each module being pressed up against adjacent modules for the flow of said exhaust gases therethrough and said modules being of different densities and arranged in order of decreasing density in a direction from said gas entry means to said gas exit means, each module having a unitary structure of compression molded and sintered metal pieces coated with a catalytic material having activity for cleaning exhaust gases from an internal combustion engine.