ROVER MINI Convertible (XN) 1.3 S Convertible Petrol 02/1998 02/2001 FWD 8 63 46. ROVER MINI Convertible (XN) 1300 Convertible Petrol 09/1992 04/1995 FWD 8 63 46. Type Catalytic Converter. It works by converting exhaust emissions into less harmful ones when the gasses pass through it, triggering a chemical reaction.