Acura 3.5 RL Manual page 21

Under-hood Emissions Control Label
Emission Group Identification
(1998 model)
Example:
VACUUM HOSE ROUTING DIAGRAM
50ST (50 States):
THIS VEHICLE CONFORMS TO THE U.S. EPA AND THE
STATE OF CALIFORNIA REGULATIONS APPLICABLE TO
1998 MODEL YEAR NEW MOTOR VEHICLES.
Engine and Evaporative Families
Engine Family:
Evaporative Family: