Hi Robin...
Yeah..the suspension setup is Dinan springs (not the lowest or stiffest by any means); Bilsteins, RD sways and some front camber plates. It's interesting to see the bar at work in the one pic, I'm sure that's what lifting up that front inside tire.
Several others at the track have commented on the lack of body roll in the car. I guess I'd never really thought about it. When you're in the car, it feels like it's heeling over quite a bit. I think some of that is associated with our nice lovely sofa seats. 
Tires are (were actually) Kuhmo Victoracers. Sticky. 225/50/16s. Ran them out that day...need some new rubber but am really holding off as I look for a lighter, more nimble track car that will be easier on tires and brakes.
Bellevue WA
90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
86 Porsche 951 - Track Toy