Abstract: An exhaust-gas catalytic converter for the purification of exhaust gases from internal combustion engines comprising: a catalytic converter body having a multi-part jointed housing having a front end for receiving exhaust and a back end for expelling exhaust with the ends forming open cross-sections. The catalytic converter body cross-section has a profile with differing numbers of cells per unit area and to change in a region-specific manner. To control the inflow of exhaust gases into the catalytic converter, there is an inflow device for providing a variable focus which allows a portion of the catalytic converter body to receive exhaust at varying levels. This inflow device opens to varying levels to the catalytic converter body based on low or high exhaust gas outputs.