High Speed Rattle?

Hi, I just got a 99 Integra GSR, everything is great with this car, but I noticed a couple of days ago that when I'm going 60 MPH+ that there is a rattling noise coming from somewhere, soudns like glove box or dash but I cant tell. It's only when I'm pressing the gas pedal, and only at high speeds, dont think its related to RPM, since I dont hear it at low speeds. I'm hoping its nothing bad just wondeirng if anyone else had seen anything like this?

Thanks for your help!