The whole PAIR idea is like thy're ****ing in your pocket and telling you it's raining.
All it does is DILUTE the pollution gases with fresh air. Them saying that it's to provide oxygen to ignite unburnt gases would mean that they whole combustion process is not stoichiometric(sp). Meaning that fuel and air mix and very little unburnt fuel is processed to the atmosphere.
According to my Haynes the early Sv models had a PAIR system fitted for California only.
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