It can be done on pre-LCI CCC systems and LCI CIC systems through a hardware add-on or via coding with NCSExpert. The coding route is much less "intrusive" as nothing is installed in the car.
Find a reptutable coder in your area or as suggested prior, contact Patryk who can do it remotely for you. Check one of his posts out here. It should have contact info:
http://forums.5series.net/topic/1104...5#entry1310955
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3-Stage Intake Manifold mod & Active Autowerke ECU re-map for 40+ HP Gain and 35ft-Lbs torque!, RPI GT Axle-back Exhaust System, Sprint Booster V2, RPI Scoop & BMC Filter, Carbon filter delete.