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Def one of the most covered topics..
You can go with H&R Sport Springs on stock shocks/struts (I went this route and am very happy); you could couple the H&R Sport Springs with Bilstein shocks or you could go with H&R or KW V1 / V3 coilovers
There is also the Dinan suspension upgrades (stages 1,2,3) for the 335xi
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