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Discussion Starter #1 (Edited)
So I installed a dinan cold air intake on my 2005 bmw 330ci, the long tube one that goes all the way down. I know someone who has the exact same one on his 323, and when he revs his engine you can instantly hear the deep sound the intake gives off. Mine only makes a similar sound above 4000rpm while driving. It'll only make a slight air suction sound while I'm driving it below 4000rpm or if I rev it in neutral. I don't think this is normal, I obviously want it to be working 100%. Does anyone know what the issue could be?
 

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Maybe the other car has different exhaust. Or it has the muffler exhaust flap disconnected and the vacuum line capped.

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Discussion Starter #5
Maybe the other car has different exhaust. Or it has the muffler exhaust flap disconnected and the vacuum line capped.

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I believe the other car has everything stock with the exhaust, while I have a muffler and res delete
 

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Could just be the fact that you have different motors. Just double check all of your connections, and if you're really that worried you can smoke test it.
 
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