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The easiest way is to insert your own ROS node between the IMU Node and the Robot_Localization Node. Your node will subscribe to the IMU data, and republish a modified message, one for one. Typically you want to remap the topic name that the IMU is publishing to, and your new node will begin publishing to the original IMU topic.

Alternately, if you have the source code for the IMU driver node, then create a modified driver. It's usually best to give your modified node a different node type so that in the future you don't get confused about which driver is being used.