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Old 06-23-2002, 12:26 AM   #9
Registered User
Join Date: Jan 1970
Location: Alexandria, VA
Posts: 3,083
My Ride: 2001 325ci
Here's the deal

Since at low end RPM, the throttle is almost completely closed under 2500 RPM, there's very little need for air intake. Once speed builds above 25mph the doors will probably open letting more air in thus letting more air into the throttle. The RPM from 0-2500 relies purely on a small amount of air and more gas mixture for combustion which the ECU takes care of automatically. This is why you need your ECU tuned with a cold air intake if you want to take advantage of it at low end speed, otherwise all the benefit is mostly at the high end RPM.

Bottom line, you will get no benefit from opening the little doors. Get a cold air intake instead with a tuned ECU.
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