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IMPREZA U.S.A. (E)
7-8
NOTE
Due to the expansion and contraction of the metals used in the manufac-
ture of the exhaust system, you may hear a crackling sound coming from
the exhaust system for a short time after the engine has been shut off.
This sound is normal.
Catalytic converter
WARNING
D Avoid fire hazards. Do not drive or park the vehicle anywhere
near flammable materials (e.g. grass, paper, rags or leaves), be-
cause the catalytic converter operates at very high temperatures.
D Keep everyone and flammable materials away from the ex-
haust pipe while the engine is running. The exhaust gas is very
hot.
OM-H0381
Catalytic converter
The catalytic converter is installed in the exhaust system. It serves as a
catalyst to reduce HC, CO and NOx in exhaust gases, thus providing
cleaner exhaust.
To avoid damage to the catalytic converter:
D Use only unleaded fuel. Even a small amount of leaded fuel will dam-
age the catalytic converter.
D Never start the engine by pushing or pulling the vehicle.