Interesting little note on the GKtech rear knuckles: You don't need to change your ride height. I installed them this weekend for the event on Saturday.
This picture isn't the greatest but, the gktech knuckle is on the left and stock on the right.
Once I dialed the camber back out, ride height was unchanged.
The trackday was wet, and on 265 Kenda KR20, the car was quite a bit faster than the other cars on track. I wasn't tandeming, but I'd catch up with the cars sent ahead of me.