DrinksomeCobalt

Hello everyone, been awhile since ive been on here.. 2009 Cobalt SS Sedan TC GM Stage 1 I just had my car in for the powersteering recall... Full of paranoia about my "baby" I had them check out a few noises..(clunk during shifts..shocks seem loud, exaust seems loud in the front..)they said everything was normal but one thing i was still worried about and maybe you guys can help..

Under acceleration at around 5 pounds of boost and above there is a sound of rushing air other than my turbo spooling... Is that just my intake sucking air in?

Bonus questions:
Would you recommend a cold air intake with a gm stage 1 tune or should i just leave it alone?

Downpipe,intercooler? yes no?

Thanks Sean