Be sure of your next step. Asking your management for an NOC will give them the indication you want to leave their company. They may not like it. It could prove to be a bad move on your part. If you do not have any issues with your present company except the salary, then I suggest you continue. On the other hand, if you are in very good terms with the management and are sure they will give you the NOC, you may take the step forward. Britexpat has very rightly pointed out "The grass is not always greener (on the other side.)"