The secondary air injection system is an emission control device that introduces fresh air into the engine to prevent high emissions during startup. Turner Motorsport has all of the SAI parts you will need to get your BMW emissions compliant.
This is the secondary air pump valve for E9x M3 with the S65 V8 engine. Over time carbon builds up inside the secondary air pump valve causing it not to close properly. This failure to close properly can allow exhaust and moisture to get past the valve and enter the secondary air pump, leading to premature pump failure.
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