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Assuming the E90 335i is tuned out the box similar to that of the E46 330ci (meaning not much more to be squeezed out), there's not much short of a supercharger or Dinan Stage III that would get the 335i anywhere in the relm of the M3
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Your comment leads me to believe that you have not spent much time in the Forced Induction/335i section on E90post.com....
Jason