Thanks for all the help. I bought the car from a widow so not much information transfer. I did notice the coil springs are red. Would stock springs be painted?
Advertise your D3 springs for sale or for "Factory spring" swap on this forum. I'll GUARANTEE that guys here will trade you straight up! Probably in less than 24 hours...
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When I changed from stock to D3 springs, the ride quality degraded little compared to the increase in performance and looks. Even though the D3 springs are 20-30% stiffer than factory, they are indeed progressive to allow retention of the majority of ride quality, unlike the linear spring rate of the stockers.
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And keep in mind that the stock V springs and anti-roll bar are 10-15% stiffer than the regular STS suspension setup, so the ride will never be as "nice" (Aka 70's magic carpet). you can, however, actually attack a turn without feeling like you're heeling the HMS Titanic with the V, though...