Weird whistle noise when I give it gas

Last night I noticed that when I push the gas pedal to accelerate I hear sort of a whistling noise along with my exhaust. I have Borla's on the car and they sound good, but this whistle noise came out of nowhere. I am wondering if there is something wrong with my exhaust pipes.

Anyone know what I am talking about??

When I sit idle with the car running no noise, but when driving and I give it gas, there it goes!
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