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Confirmed front springs are actually Weltmeister progressive rate 250 lb 1" lowering, not 450lb. So for now I'm planning on bigger rear sway bar? and Koni Sports on full stiff in the rear.
Quite a few years back, I had an S2 with progressive front springs. Can't remember the rates now, but closer to the Turbo Cup springs. Also M030 front sway bar and stiffer Welt rear sway bar. However, I also went up one mm on the torsion bars for more balance spring rate balance. it was a good street/track compromise. Stiffer T-bars gave a harder rear bounce, but not bad.