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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 01-25-2005, 11:49 AM   #1 (permalink)
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I just got a Dinan High Flow Cold Air Intake installed on my 2001 330Ci yesterday (with the Stage 2 Engine Software and the Automatic Transmission Performance Software, as well). I really love the difference in acceleration/sound. However, I noticed that there is a kind of a whistle or a whining sound that happens sometimes when I'm already going a good speed, and just have my foot on the gas to maintain the speed. Of course, there's the sucking sound that happens when you punch it, or really give it gas, but that is just the intake taking in the air, and I know that's normal.

Is it normal for the more constant whistling/whining sound when just driving at a constant speed? It doesn't do it the whole time, but it will do it for quite a while, unless I adjust the gas I'm giving it. With the windows closed, I can't hear it, only with the windows open.

Any advice? Thanks in advance!

~ Jennifer
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Old 01-25-2005, 12:07 PM   #2 (permalink)
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Yes that is normal... its just the way the air is being twisted... due to the new path of air... mine does the same thing..

I dont have the exact explanation.. but its normal..

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Old 01-25-2005, 12:24 PM   #3 (permalink)
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i dont have a dinan CAI, but do have one, mine whistles too. seems normal to me
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Old 01-25-2005, 12:26 PM   #4 (permalink)
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Thanks, guys. I appreciate the input (and so fast, too!). I'm still giddy about the better performance.
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