Actually I can almost dead hook 1st-4th @ 8PSI...it just spins slightly. Before was just slightly better traction with the drag struts and soft front springs. When I FIRST put the bilsteins on I was having slight traction issues @ 9PSI in 3rd gear...but now thats went away and to be honest with you it hooks almost the same now.
But I do know why I had traction issues at first. When I first installed the bilsteins and new coilovers (275#s vs my old 175#s) my front ride height dropped quite abit....and that combined with stiffer struts/springs hurt my traction. But after raising it to a little higher than before its actually almost the same as the full drag setup...I really cant tell any difference. But man the ride quality is SOOOOOOOOOOOOOOOOOOOO much better, its unbelievable. And you can tell when going over bumps that the downward motion is dampened almost instantly with these Bilsteins vs my drag struts which would allow the car to dip.