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The smog pump pumps oxygen into the exhaust after combustion. It reintroduces oxygen into the exhaust so the unburned HC can be reburned in the exhaust.
It won't affect the mixture at all, but will lower the emissions. You won't need to readjust the mixture.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer)
'72 911T Targa MFI 2.4E spec(Formerly "Scruffy")
2004 GT3
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