If its a 2010, it doesn't even need a hardware module, it is a software update only; I've heard about $500. If its a 2009 or ealier, it needs a $400-500 module and labor time for install and programming. When I looked for my 2008, it was about $800.
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'10 335i sedan/AW/Premium/M-Sport/Steptronic/Active Steering/6FL/Logic7/Sirius/heated seats/rear fold seat/alarm/Navi/Performance Power Kit
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