Even in normal Flight mode, the Custom Flag's cruising speed was measured to be twice that of regular Flag's. To achieve this speed, the hydrogen fuel payload for its plasma jet engines is reduced, lightweight armor materials are utilized, and its flight units are switched to a large, high-output type that is difficult to control and thus not adopted by regular Flag. The two bold weight reduction measures also allow the Custom Flag to be lighter than the regular Flag even with the installation of the larger flight units. The cost for the mobile suit's high speed is that even with the activation of the anti-G system, Graham will feel 12Gs of acceleration when turning at full speed. As a result, this mobile suit cannot be piloted by anyone else other than Graham. However, even Graham admitted to having problems handling the high Gs after coughing up blood following his battle with the GNW-001 Gundam Throne Eins.