Pretty obvious, but I'll point it out: This lets you change your FOV (field of view) when in vehicles, which by default varies between either 70 or 75, both of which is pretty low. This mod changes it to 90 by default, and you can go up to 150 if you feel crazy.

Originally inspired by http://modwork.shop/18064 although I'm using entirely different code and added a menu integration (options > mod options > custom vehicle fov) to top it off.