When I downloaded this mod for the first time I realized that the vehicle colors in Saints Row IV had been created to look good at night first and foremost (which kind of makes sense since SR4 takes place primarily at night). That's especially true of the glossy colors, which look particularly horrendous during daytime.
Here's a pretty good example of that:
SR3 vanilla colors:
SR4 colors:
That's even something you can notice in SR4, if you use the ToD that simulate daytime after you beat the game.
That was my main gripe with this mod for the longest time, even if I actually really like most of the other color palettes for the vehicles and think they look much better than the SR3 colors overall.
Now that I actually know a tiny bit more about Saints Row modding I decided to make an alternate version of this mod that keeps the SR3 colors for the gloss palettes, and gives you the SR4 palettes for Iridescent, Pearlescent and Candy. So, here it is if anyone is interested.
Installation is the same as the original mod, just drop the file in your root folder.
All credit goes to Denvas.