Alright Guys so I figured out what my rattling noise was.
Under the vehicle you need to remove the black underbody panel on the drivers side. Under there right next to the exhaust resonator you will see a fuel line. There is a white bracket that holds that fuel line and a few other lines. Well...
I am having the same issue but not as loud. Mines happens between 1600rpm - 2100rpm. It gets worse when the vehicle is warmed up. I did some investigating and it sounded very pronounced right under the shifter. I took some of the plastic panels off to look under the shifter and I did not see...