You'll find everything you need to know at e90post.com or 1addicts.com. There are various levels of conversion. Most parts are simple bolt-ons, however some parts, require additional parts from the M3. For example, the rear struts on the M3 and 335i use a different connection to the camber arm, so if you change to the M3 camber arm, then you have to change struts. Similar issue with the differential and drive shaft connection.
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