JAGUAR XK 8 Convertible (X100) 4.0 XKR Convertible Petrol 05/1998 10/2002 RWD 32 375 276. JAGUAR XK 8 Coupe (X100) 4.0 XKR Coupe Petrol 05/1998 10/2002 RWD 32 375 276. Type Catalytic Converter. It works by converting exhaust emissions into less harmful ones when the gasses pass through it, triggering a chemical reaction.