First Track Sprint this year.
I ended up with 225/45/17 Hankook RS4.
It has stiffer sidewall than RE71r for sure. Surprisingly quieter as well.
Ultimate grip level seems little less than RE71 but I feel like this tire is batter suited for the stock suspension. (Maybe RE71 was little too much?)
Haven't tried it for auto x yet. Will see how the shoulder wears.