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Old 05-19-2013, 09:26 PM   #11
14 Years with the E30
InfiniteDice's Avatar
Join Date: Sep 2006
Location: St. Catharines
Posts: 1,154
That is usually hooked to the air filter box. I believe it's an air pressure sensor so if you change elevations it allows the car to run properly.

Performance one step at a time.
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