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There are 25mm factory sways...but they are notoriously hard to come by. 15th anniversary had them, and reportedly some 85 WS6 cars had them. They are out there, but doubt they're worth the effort to find one.
The Pro Kit springs I have on my cars are 714 lb fronts and 110-175 lb? rear progressive. It was awesome on the highway and corners, ride can be a lil rough, but part of that may be the Koni settings. Not sure where Matt had them set.
Eventually, if I want to change the springs, I may go with some springs similar to what you have or weight jacks. Problem I have with the weight jacks is you're cutting up the interior to use them. But for now, I like the Pro Kits. And I want to get it done first. Can always change springs later.
If you come up to the Wild Wings meet in Rockaway, you can see how the Pro Kits compare to your Iroc's springs. Provided I have the car there.
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