California-based Vorsteiner prefers working on the German brands BMW, Mercedes-Benz and Porsche. Having already provided kit for the BMW E92 M3 (coupe) Vorsteiner has now released a new lightweight aero kit for the E90 M3 (sedan). The package is made up of parts like a carbon-fiber add-on spoiler, a carbon fiber rear diffuser with three integrated fins and a carbon fiber boot lid with a lip spoiler. The latter acts to enhance down force and weighs over 35 percent less than the stock unit which is...