The Clio event is sweet!
Had a great time on it using a bog standard Clio Phase 2 with racing tires.
The Clio race cars are faster than you in terms of speed, but you can take time out of them on the corners with your racing tires. Providing you drive well you can win, and are in for some great racing at the same time.
Don't go for super soft tires as they will be in shreds before the end of the race.
Anything above that and you are fine. I was using soft racing tires which gives you about 131 A Spec points. If that isn't enough challenge for you, increase the hardness (?) of your tires.
Suzuka I won by 0.123 seconds! Made a couple of minor mistakes, but overall pretty good.
Motegi I came off badly on the second corner of the first lap. Was never able to make up the deficit. Came last. Possibly the toughest because there are lots of fast sections.
Won the rest pretty comfortably to grab the Clio Race Car prize