Acura NSX 1997 Service Manual page 1198

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Under-hood Emissions Control Label
Emission Group Identification
Example:
50 STATE TIER 1:
THIS VEHICLE CONFORMS TO U.S. ERA AND STATE OF
CALIFORNIA REGULATIONS APPLICABLE TO 1999
MODEL YEAR NEW MOTOR VEHICLES.
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Engine and Evaporative Families
Engine Family:
Evaporative Family: