So yea, I was bored and made this, end of story.
It changes the colors of contours to be more vibrant or have higher saturation.
Most of the things are going to have a purple-ish outline as this replaces the original orange.

Mod is fully customizable, so adjust it to your taste

For reasons unkown to me, some contours might still have the old colors, like gas on Heat Street. Like I said, I have no idea why. Perhaps it's controlled by a different string ? Will look into it again soon.
Also, there are some strings that change something I couldn't see ingame, i think i put total blue (0,0,255) there