Subaru WRX & WRX STI Manuals 2018 WRX & WRX STI Owner’s Manual | Page 429

Driving tips/Catalytic converter
exhaust fumes are entering the
vehicle, have the problem
checked and corrected as soon
as possible. If you must drive
under these conditions, drive
only with all windows fully open.
. Keep the trunk lid closed while
driving to prevent exhaust gas
from entering the vehicle.
Catalytic converter
NOTE
Due to the expansion and contraction
of the metals used in the manufacture
of the exhaust system, you may hear a
crackling sound coming from the ex-
haust system for a short time after the
engine has been shut off. This sound is
normal.
STI
8-3
reduce HC, CO and NOx in exhaust
gases, t