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Old 08-30-2001, 12:01 AM   #1
Scooby Specialist
Member#: 3316
Join Date: Dec 2000
Location: [CA], MA, AZ
Question Cobb Cold Air Intake Whistle. Normal?

Hey everyone!

I've had a Cobb CAI on my 2000 2.5RS for a few months now. There has been an annoying whistle sound coming from the intake even since I put it on. I thought if I waited it might go away but it's been a pretty long time with no change. The whistle happens through out the RPM range just as you *really*put your foot into the throtle (just before the "trademark" aftermarket boxer intake sound kicks in). I'm not sure if its coming from the intake or from the fender when the air is being pulled.

Has anyone else had this happen? I'm pretty sure this is not a desired sound.

Any info would be much appreciated.

Scott French
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Old 08-30-2001, 09:27 AM   #2
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Member#: 6878
Join Date: May 2001
Location: St Inigoes, MD, USA
2002 MBP 2.5RS
1994 GMC Sonoma


The only whistle sound I have heard from mine is from the vaccuum hoses at low throttle and it's not very noticable. I have to be listening for it (and I love the sound of it).

How loud is the whistle?
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Old 08-30-2001, 10:30 AM   #3
MY99 2.5GT
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Member#: 5030
Join Date: Mar 2001
Chapter/Region: MAIC
Location: Martinsburg, WV, USA
1999 Legacy 2.5GT
12 Legacy GT 13 Armada


I have a Weapon R that does the same thing. It sounds like a whistle coming through the two middle AC vents in my dash.

It is kind of annoying when your cruising down the highway or when your listening to the radio and you hear this high pitched whistle. I don't know about yours but mine is pretty loud.

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Old 08-30-2001, 11:55 AM   #4
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Join Date: Dec 2000
Location: [CA], MA, AZ

I'm not sure how loud it is. It's loud enough to be annoying and that's why I am posting about it. It doesn't happen all the time. I wont be driving down the highway with a whistle for 20 miles. It only does it when I put my foot into the gas pedal hard; right before the intake really starts to growl.
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Old 08-30-2001, 12:00 PM   #5
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Member#: 4001
Join Date: Feb 2001
Location: I love spherical bearings!
2006 Legacy GT
Obsidian black


I've got that same whistle. But I like any sound that is supposed to be there. Loud or not.

However, if I hear even the slightest rattle, I will tear the car apart looking for it.
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Old 08-30-2001, 12:07 PM   #6
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Member#: 4034
Join Date: Feb 2001
Chapter/Region: BAIC
Location: Cupertino, Burlingame, Davis,
2005 Infiniti G35c
Ivory Pearl


whistles from AEM CAI's.. usually are caused from the way the pipe was made.. so that when the car takes in the air, it swirls it around to create cooler air... i think.

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Old 08-30-2001, 01:06 PM   #7
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Member#: 3608
Join Date: Jan 2001
Location: the T-dot - The green igloo billowing black smoke
2000 Impreza
Tanned - BRP


Yes, It happens to me when the air is cooler than ususal. The best intake I have heard thus far.

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Old 08-30-2001, 03:53 PM   #8
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Join Date: Dec 2000
Location: [CA], MA, AZ

This whistle isn't the regular intake sound. It sounds like a tiny blow off valve. You can control the whistle with your foot. Meaning, drive down the road, no whistle. Push in the throtle 1/2 a centimeter deeper, whistle starts. Let out throtle 1/2 centimeter or push it in a 1/2 centimeter more and it goes away.

Occurs at all temperatures.

Oi. Not lovable, just annoying.
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Old 08-30-2001, 11:24 PM   #9
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Member#: 815
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Location: Florida
2013 Boss 302 White
2008 S2000 CR ABP


I have the same exact thing. Sounds like a turbo spooling up to me, I like it.

- Steve
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Old 08-31-2001, 01:30 AM   #10
Dolphin Overton
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Join Date: Jul 2000
Chapter/Region: RMIC
Location: denver
01 A4 89 944s2
13 Speed 3R 99 Sprint


My COBB CAI sounds like a turbo
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Old 08-31-2001, 12:06 PM   #11
MBX Motorsports
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Member#: 3726
Join Date: Jan 2001
Location: Newark, DE
2001 2.5RS
Blue Ridge Pearl


That's normal for a CAI to sound like that. It's louder because you no longer have an intake silencer, and you have a higher flowing filter. This allows the motor to pull more air into the engine, which creates the loud whistle/suction noise.
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Old 08-31-2001, 12:16 PM   #12
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Join Date: Nov 1999
Chapter/Region: South East
Location: Charleston, SC
1981 jdm swapped gc


its the vent hose coming from the engine the 2 hoses that come from the crankcase suck air in and the one single next to the throttle body vents out....thats the sound you here, sounds cool to me! thats my op.

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