Using Trainers (like the XOSC or TeamXPG trainers), you can toggle cheats on the fly, which is perfect for exploring the massive, detailed skyboxes of Cybertron without being shot down. Summary for your Post:
Because the game was delisted from the Xbox Live Marketplace, obtaining the DLC (like the or Ecto-1 skin) through official means is impossible. Transformers War For Cybertron [Jtag/RGH]
Since official servers are down, your modded console is the best way to play with others: Using Trainers (like the XOSC or TeamXPG trainers),