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The most predictable option is to install base springs/shocks and go down a wheel size. I would try downsizing the wheels to 17 if you currently have 18's, then decide if you want to do the shocks as well. The base suspension is about equivalent to Bilstein B4, much cheaper than genuine Porsche. My base 2.5L has what I consider the perfect blend of handling and ride quality on 17in wheels, and I commute on Detroit roads.
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