MTV writes: It's no secret that 50 Cent and Eminem have amazing in-studio chemistry. The two hooked up early on a few mixtape tracks, but made their first official splash on "Patiently Waiting" from Fif's 2003 debut Get Rich or Die Tryin' and then again this week on the G-Unit head's new single "My Life." Now what if Shady's Gatman and Robbin' gave us a tag-team album of their own, similar t…