Ferrari 612 Scaglietti Owner's Manual page 112

The injection system supplies additional air to the exhaust manifolds in
order to reduce HC, CO and NOx emissions during the warm-up phase
of the pre-catalytic converter, inside the manifold, and of the main
catalytic converter.
The air, taken-in through a special filter, is delivered, sometimes in
large amounts, by means of an electric pump, controlled by the right-
hand engine ECU.
This causes any hydrocarbons in the exhaust gas to be burnt.
Air injection is activated when the coolant temperature is between
–10 °C and 40 °C ± 3 °C (it does not operate with water temperatures
3
below –10 °C to prevent the exhaust system overheating due to an
excessively rich mixture).
112
Catalytic converters
This vehicle is equipped with metallic-type catalytic converters.
The catalyst system consists of four pre-catalytic converters and two
main catalytic converters.
The catalytic converters reduce the emission of HC, CO and NOx into
the atmosphere.
Each exhaust manifold has a pre-catalytic converter which, due to
its proximity to the exhaust outlet, reaches operating temperature
more quickly and ensures more efficient exhaust emission reduction
immediately after engine start.
There are two threaded seats on the manifolds (one at the inlet and one
at the outlet of the pre-catalytic converters) used to mount the front
and rear oxygen sensors. The main catalytic converter inlet is equipped
with a thermocouple, which is connected to the engine ECU.
The sampling of the exhaust gas can be performed by means of the
unions found on the catalytic converters.
Do not leave the unions open with the engine running as the exhaust
gas could cause the check valves to overheat and consequently break.
To prevent serious damage to the catalytic converters, it
is essential that only unleaded fuel be used.
Do not park the vehicle over paper materials, dry grass
or leaves, or flammable materials that could catch fire if
they come into contact with hot parts of the exhaust system.