If you have a set of the ST springs you'll find the drop at the front is approx 1.5 inches using the original rubber hardware, I had a set of those sitting on the shelf for more than 10 years. I couldn't find any Intrax at the time I was looking for drop springs, last year I finally did the cars suspension, the ST are a linear rate spring like the OEM springs. In my case that is better for the car where clearance is concerned seeing as the tires outer corners are directly under the wheelwell lip, spring compression can't allow contact between the tire & the fender lip, the other 3 bodylines don't display this issue as the fenders cover the wheels entirely. They do rider firmer, but to me that's not a negative seeing as (in my mind) the oem ride is far too soft.
The new rear spring is as the chart shows 330lbs. per inch spring rate, this firms up the rear, along with the custom alignment the car corners more exactly, flatter, considerably less understeer.
The car doesn't *float* anymore.