Directly from the Intrax website.

Originally posted by Intrax:
What makes INTRAX springs better? INTRAX designs most of its lowering kits with progressive rates, to satisfy the two features you've asked for most. First, the lowered look. Most other brands' springs are linear rate, as this is cost-effective but doesn't necessarily provide the visual effect you desire. By designing a progressive spring, we achieve the lowered look while maintaining safety standards of spring preload at suspension droop. The second requirement is ride quality. Since most of you identified that you drove 90% of your mileage to and from work, you wanted to retain some ride quality enjoyed with OE springs. If you're driving to work on a racetrack, "Sport" or "Race" springs from other brands may be for you. INTRAX progressive springs provide high performance looks and comfortable ride quality.
INTRAX creates the finest springs, from start to finish.
*
INTRAX springs begin the forming process with cold winding to the most exacting standards. Within two hours of forming, springs are stress relieved in an oven (not to be confused with heat treating), and then shot peened to remove surface imperfections and further relieve internal stress. This can extend service life of a spring up to 200% or more. Next, the spring is "blocked" (wound to a longer length than required, and set in a hydraulic press to obtain designed free length). This eliminates the "settling" other brands require, due to the lower cost of their production processes. Finally, springs are Phosphate coated for corrosion resistance, and electrostatically powder coated to ensure a lifetime of outstanding looks.





I have the Intrax springs myself and I LOVE them. Now, you are looking for a "soft" ride. My ride right now is pretty firm, but my struts are also almost shot, so it is hard to tell if the ride is accurate. I personally like a hard, firm ride. I wouldn't say stay away from Intrax because they are BAD, they just probably won't meet your expectations for a "soft" ride. Even though they claim to give you the OE type ride and not the "race" ride, for me, the ride is pretty damn firm. Just vouching for Intrax personally because it seems that some on here are bashing them. Also, the site states that some of the Intrax springs are Progressive and NOT ALL are Linear like someone mentioned earlier. Either way, I don't think these are what you are looking for, I just wanted to give my $.02 on the matter since I have them installed on my SVT.


-Bishop

*Invisible Hero* 1999 SVT Contour/Amazon Green Keep It Real. Beware the fury of the silent man.