Secondary AIr Intake (SAI)... draws air into the exhaust ports for emissions purposes... most peeps either stick a little air filter on it (cheap from ebay) or do an SAI delete (see stickies...)
delete the sai and save some weight.
i ditched mine and the evap and n112 and the n249.
All the stickies, no problems if you use resistors or leave electrically connected.
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