Plates starting from R indicates a Subic registered unit, while a B-plate indicates a Cagayan registered unit. Cars with these plates are usually converted.

My uncle used to have a 1st gen 3 door Pajero. Somehow he managed to blow up the original 4D56 engine and so swapped it with a 4M40 engine, while still using a manual transmission. This combo gets him around 8km/L city, lead footed driving.