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Originally Posted by VeilSide_S2000

One of the secrets behind the S2000's clean exhaust emissions is air injection. When the engine is cold, a shot of air is fired into each exhaust port to help ignite unburnt exhaust gas particles. The burning particles heat the exhaust gases in the manifold, quickly bringing the smog-scrubbing catalytic converter to peak operating temperature.

Thanks VeilSide_S2000 for the informations !!!