CF1, 1.6, 1.8 and 2.0 litre cars have an alloy rocker cover.
CF2, 1.6, 1.8 and 2.0 litre cars engines have a plastic rocker cover and only 1 catalyst with a throttle cable
CF3, 1.6, 1.8 and 2.0 litre cars engines have a plastic rocker cover and 3 catalysts with an electronic throttle
CF1 V6 2.5 or 3.0 litre cars have the engine ecu in the passenger foot well and a throttle cable.
CF2 V6 2.5 or 3.0 litre cars have the engine ecu in the passenger foot well and only I catalyst with an electronic throttle.
CF3 V6 2.5 or 3.0 litre cars have the engine ecu on the inlet manifold and 3 catalysts with an electronic throttle.