I know the conversion/wiring concept. Just scared to do the physical wiring without getting some tips from people who has done it already. ADHD's DIY link:
http://www.e90post.com/forums/showthread.php?t=28035.
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E90 2007 / Step / Montego Blue / Black Dakota Leather / Premium / Cold Weather
MODS: Exterior: Blacklines, debadged, HO ceramic 35% tint, Hoen yellow fogs, matte black grille, OEM style splitters, Halogen-to-Xenon Interior: Alum pedals, CF wrapped trim, V1 and Nuvi hardwire, M-Tech tri-stitched wheel, SMG M5 shift knob Performance: AluFelgen CSL 19" 8.5 ET33/9.5 ET30 with 5mm rear spacers | GY Eagle F1 Asym 235/265, KW V3, BMW Perf exhaust+intake