I haven't been banned for modding Fotus and other pre-order items, but it's not impossible for them to catch you. Do not mod everything without at least a 50% chance ban. They can check your commendations and then find out form that... If you're going to mod your armor only, mod bit by bit and you wont be caught. It's not impossible but not super easy for them to catch you modding armor such as fotus because it is in your GPD so they wouldn't be able to find out any mods on your side easily, especially a pre-order helmet/armor piece.