first of all you will need to have a close idea of what the car's weight on the front wheels is. You could probably find that information online if your car isn't lightened up a lot in the front. I would call qa1's tech department and get their suggestion. As a general rule a light spring rate in the front won't corner as well, but it will help weight transfer off the line. The shocks will be adjustable, so you can use different settings for the street and the track. In addition to that it's not very difficult to change springs on a coilover if you wanted to play with spring rates, and you can do adjustments to ride height and crossweight.
