Subaru 2003 Impreza - Manual (Page 257)

IMPREZA(NA) A1850BE-A (ENGLISH)
Driving tips
8-4
Catalytic converter
Turbo models
Non-turbo models
The catalytic converter is installed in the exhaust
system. It serves as catalyst to reduce HC, CO and
NOx in exhaust gases, thus providing cleaner ex-
haust.
To avoid damage to the catalytic converter:
D Use only unleaded fuel. Even a small amount of
leaded fuel will damage the catalytic converter.
D Never start the engine by pushing or pulling the
vehicle.
D Avoid racing the engine.