i raced my 05R on carpet today, running RP30s, CO27 and DNA2. for the heck of it last night i reinstalled the rear stock swaybar and moved the steering hub ball joint to the rear position. all i can say is that the car is performing so much better than the last time i ran it on carpet. the car feels so much more responsive, and i'm sure it's because of the rear swaybar. before, it felt a little numb and sluggish, but now it's very quick and has excellent turn-in without wheel scrub. i qualified 5th in the B, and finished 2nd in the B main. nothing like a set of broken in tires too!