I installed a set of the following suspension parts on my car and it said youneed to set the preload just right or it can cause the pparts not to perform at there best. Well, first let me say that my car usuall never really runs a consistent sixty. It seems that it is always all over the place time wise. I run anywahere form a 1.75 to a 1.90 in the sixty. I have a set of Mickey Thompson Street E.T 28 x 12.50 x 15 tire. I have a limited slip in with 3.73 gears and a 3400 rpm coonverter. I hope that this helps with the equation. Now for the following parts i put on. I nstalled a set of the UMI double adjustable upper control arms and a set of UMI single adjustable lower control arms. I put in a set of 90/10 Competition Engineering shocks and a set of the 60/40 rear Competition shocks on the rear. I have Moroso trick front and rear springs and one air bag in the right rear spring. I don't have an anti roll bar or sway bar in the rear. I do however take out the fron sway bar bolts at the track for maximum weight transfer which makes it stick real hard and i have even had the front tires off the ground 2 times now, even with a crappy sixty foot time. I have not been able to set the pinion angle yet either that could be part of the problem i am having. I just thought that with all the parts i have installed my sixty would have dropped a tenth or two or am i wrong. Sorry for being long just wanted to get it all out there fo all to analyze. ](*,) :-k