Abstract: This paper presents a study on the comparisons of the HC and CO emission levels on exhaust gases that expels through an existing home used (imported) car converter, a refurbished catalytic converter with a new honeycomb. The performance of a home used catalytic converter, refurb damaged catalytic converters by replacing the worn-out catalyst elements with imported ceramic honeycomb catalysts and compare the performance of the used catalytic converter to that of refurbished and two other locally developed converter of a Kia Sportage LX exhaust system were studied.