Check out the Tein S-tech. Their spring rates are well matched and only further lower the factory sport suspension by about half an inch. I have had them for almost a year and they have works marvelously with my Bilstein B8s. Especially at higher speed.
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E90 330i 6MT ZSP
BMW Performance Exhast///M-Tech Steering Wheel, Shift Knob and Pedal Set///M3 Suspension Arms///Tein S-Tech///Bilstein Sports
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