It won't really change the engine noise, it'll just change/enhance the air-going-into-your-engine-noise which ends up sounding Darth Vader-ish if you are using an aluminum cold air.
if you replace it, it will just sound the same if you upgrade it you will gain about 2-3HP and use more fuel meaning less mileage I HAVE A 2003 TAHOE AND I INSTALLED THE COLD AIR INTAKE AND IT GAVE IT A BETTER SOUND
A pressure test on the cylinders will tell if you have a bad head gasket. If you hear a whistle sound near the intake gasket, spray WD-40 (or any type of petroleum spray) on the area and if there is a leak the engine rpms (or engine sound) should change.
To check if you have installed the sound card, you would typically look at the Device Manager on a Windows PC. Under the "Sound, video and game controllers" section, you should see the sound card listed there if it's installed correctly. Additionally, you can also check the audio settings in the Control Panel to ensure the sound card is recognized and configured as the default playback device. If the sound card is not listed or shows a warning symbol, it may not be properly installed.
Generally speaking, if you had a plastic/rubber intake and you switch to an aluminum cold air intake, then yes, you are going to have a different sound of your engine taking in air... it's going to sound a little more Darth Vader-ish. This will be enhanced if you also use a metallic stainless steel filter like Blitz, CP, X3, etc.
roll back the driver
Get a 2nd opinion from another mechanic or friend.
Check for a vacuum leak around the throtle body and intake manifold.
A defective vacuum line can cause a whistling sound when the vehicle is accelerating. A loose belt can also create a high pitched whistle sound.
Device Manager
Ask the IT Department.
On a 2006 Ford Mustang, the sound tube is located in the engine compartment, specifically connected to the intake manifold. It runs from the manifold to the cabin, allowing engine sounds to be transmitted into the interior for a sportier driving experience. You can typically find it on the driver's side near the firewall.
Mine does the same thing.. and im pretty sure that it is the auxiliary fan