On these Diesels, most CAI's will degrade the performance because they are actually a hot air intakes (draws air from inside the engine compartment) and also the filter media with these CAI's does not filter as well as OEM.
If you want to hear the turbo, get a bigger turbo and accept the turbo lag. Just because you can hear the turbo whine has absolutely nothing to do with how efficiently the turbo is working.
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