There's mods available for assetto corsa. I have a stock one and also a 300whp one but the 300 whp one is severely lacking front grip
If the one you're describing is the one I'm thinking of, I was very unimpressed and have basically never used it. The WRC Fiestas are well done, but AC handling isn't my favorite and I could never seem to tweak it sufficiently to be nice to use. And they're of course AWD and high horsepower, but I do love them.
As far as handling is concerned I ended up getting one of the EK9 Civics included with the Shutoko Revival Project (I believe by Esprit3905) pretty close and while it's not identical particularly in regards to powerband, the lines are right and that's all I really care about at the end of the day. Ended up doing the same with the FK2 in Gran Turismo 7 which
also unfortunately lacks the Fiesta, but that I got set up closer to my roommate's Veloster N as it's a more correct comparison. The fundamentals are pretty similar though and I actually ended up enjoying GT7 more as a training tool than AC, which was unexpected. The quality control and consistency in tuning settings probably helps, nothing like downloading a car for AC and having wildly different options that on the surface should be the same.