The engine's name was not publicized until IGN was told at the E3 2009 by the studio that Call of Duty: Modern Warfare 2 would run on the "IW 4.0 engine".
Motoren havde ikke et officielt navn indtil IGN blev fortalt ved E3 2009 af studiet, at Call of Duty: Modern Warfare 2 ville benytte "IW Engine 4.0".