Heat transfer enhancement in a car radiator using different nano fluids has been performed very often. but use of artificial roughness has been seldom done. In the present work. artificial roughness in the form of ribs has been incorporated in car radiator. https://www.roneverhart.com/MagnaFlow-2009-2011-Buick-Lucerne-OEM-Grade-Federal-EPA-Compliant-Direct-Fit-Catalytic-Converter/