If you are running the stock air box... . you'll hardly hear any whistle.
I bought a AEM Brute Force intake with the dry-flow filter... . took 15 minutes to install and it sounds perfect now. You know the sound of a big rig when you are cruising past it... you don't hear the sound of the trucks engine,you hear the turbo whistle. No need to disturb the silencer ring either,as I think it funnels air more effectivley in to the turbo intake than with the ring removed.
I see you are running a BHAF... . that should allow plenty turbo whistle.