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I'm not sure what they make for sedans but I have a coupe. I've seen a few different types of springs for these cars. Eibach, Tein, tanabe, vogtland. Make sure you upgrade your shocks struts also and camber kits.
For the Sedan's... B&G and Suspension Techniques are the only 2 companies that make lowering springs. Eibach used to, but they discontinued that part. I've never heard anything about Suspension Techniques, but I know the B&G's are good.
For shocks, KYB and Koni are the only 2 making them for the Sedan's.