Rattle in 1st gear

[Jcaron9gt4]

I know this is a shot in the dark, and it will take me some time to locate the source of the rattle/vibration. But I have an automatic, and when I take off, as soon as I hit 2500-4000rpms, in 1st gear only, I get this terrible rattle/vibration coming from under my hood. I'm thinking it might be my intake box, only because of the exact throttle position and rpm's it happends at. Just seeing if these intake boxes are prone to getting loose, or if there's any other plastic panels known for coming loose. I'm new to the tsx scene, so I'm still a little unfamiliar as to where all the panels, etc are. My last car I could locate the noise as soon as I heard it.