I think it's quite complicated as it's tied into the CAS module with the keys. I think I remember reading some posts about it on E90post, you may want to search there.
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2011 LMB E90 335xi 6MT: Wagner EvoII FMIC, Catless DP, PE Mod, Cobb CP, BMC Filter, ST Coilovers, Strongflex TSB's, Whiteline RSFB Inserts, CDV Delete, Hawk Talon Rotors & PC Pads
2011 SGM E91 328xi 6MT: 3-Stage Intake Manifold, ST coilovers, 335i brake kit, drilled/slotted rotors, CDV Delete, Charcoal Filter Delete
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