I don't know if there is a FOV Adjuster for Carbon yet, but however you can get the debug camera mode via the Extra Options script. Look up NFS Carbon Extra Options by nlgzrgn. There is a version of this script, which is v3.0.1.1338.
When you have that installed, open the .ini file, find "EnableDebugCamera". If it's on 0, change it to 1, and save.
When you have that installed, open the .ini file, find "EnableDebugCamera". If it's on 0, change it to 1, and save.