I'm trying to determine the appropriate spring rate needed for my car with the HQ ridetech coilovers. I know they have a calculator on their site, but it involves mocking up and installing a bunch of parts to determine the appropriate spring rate. I know that my car weighs 3450lbs, 3650 with me in it. I am not interested in all out race competition withthe car, I just want it to be alot more sporty than it is with the original coils/shocks. Has any one here purchased a set of the ridetech coil-overs for their Turbo Regal, and what spring rate did you choose?