To be honest, I probably haven't gone over 70-75 yet. Taking a week long road trip around the Sierras starting tomorrow under a variety of conditions. I really like the current look and plan to raise the rear an inch with Bilstein springs and shocks. Maybe toss in some poly swaybar endlink bushings front and rear to stiffen it up a little. (was noticable in my Camaro before I upgraded to monster sways). I hate the rear rebound and sway of the Nivomats. I would hate to drop it back down. I appreciate the heads up. I'll report back.