I had a 92 GT about 6 mustangs ago and it had a BBK CAI on it. That thing would whistle when sucking air in. People didn't ask IF I had a supercharger, they asked WHAT KIND OF supercharger I had. I would tell them none at all, and they didn't believe me unless I raced them and lost. I had a Moroso CAI on my 91 GT I just sold and that one whistled loudly too. Both kits were "in-the-fender" style. I would say you will hear it when you hit the gas lightly, not letting the roar of your blower overpower the whistle of the CAI.